Fenny Stratford is a bit of an elephant in the room, ideally you want single line occupation as low as possible.
Yes, much as
@DarloRich would kill us it isn't an overly useful station and is a short walk from MK's most frequent bus route. Couple this with the new entrance on the town side of Bletchley station (the walk round is about 0.4 miles according to Google) it probably has even less of a role, and as you say it's a bit in the way on the single line section. TBH I'm more concerned about the impact of closing Simpson Road and definitely think a well-lit and CCTV-covered foot and cycle bridge needs providing there. I know there's the canal but some won't feel safe walking down there alone at night. As a minimum the railway should fund and operate lighting and CCTV on that section of the towpath.
The ones I'm concerned primarily about are:
Bow Brickhill - this is presently underused, but has the potential to be much better used due to the large amount of employment nearby. There is also a plan to develop (for housing) the land between Browns Wood/Tilbrook and Woburn Sands Road which will bring a load more housing into its catchment, and may provide a fair bit more demand with a much improved service. The station is miles from the village it nominally serves, but it's probably misnamed now - it should probably be called "Tilbrook for Caldecotte Lake" or something.
Talking of the new development, in a parallel universe where EWR wasn't being built I'd more propose an additional station half way between there and Woburn Sands to serve the new development. But in the context that it is, perhaps funding a quality cycle and footpath facility (Redway standard) parallel to the railway between Old Farm Park and Woburn Sands station might be better?
Ridgmont - this is used a fair bit by commuters to the Amazon warehouse and surrounding businesses, and is probably another misnamed station, probably being better named as Brogborough which is much nearer than Ridgmont is. It appears that the proposal is to move it just the MK side of the motorway, which in my view would reduce this usage because of the need to cross, on foot, a major road junction which does not have decent pedestrian provision. I accept there are practical constraints, however. Provision of a decent car park as a J13 Parkway might be useful if a service was going to go to MKC (something I still strongly believe should happen post-HS2, either via a reversal or a new chord). I wonder if it would be possible to move it to behind the warehouses instead?
Apsley Guise - this village is very spread out though there is an area of housing around the present station and the route round both on foot and by car is long. Perhaps a new single carriageway road including a Redway standard cycleway is necessary to connect with Woburn Sands, or at least the cycle facility?
Lidlington - I don't see much of an issue with the proposed move - I suspect the people who live in the houses facing onto the present platform would be happy with that not being there to give them better privacy, provided the road from the village to the new station has a Redway standard (2m minimum width, quality red tarmac surface) foot- and cycle path added. Perhaps this could be along the railway itself as it would only require a small purchase of farmland to do it. Relocated to Marston Crossing with a decent car park and a Redway standard path to Marston Moretaine this would basically render Millbrook completely unnecessary.
Stewartby/Kempston Hardwick - on balance I think the merged station (Wootton Broadmead level crossing I think) might be a good place to have it at the heart of a new eco-village, perhaps? It would mean no station serving the Millennium Park but if there's an attractive landscaped cycle and footpath facility from the merged station to Stewartby lake people might well find that acceptable, given that the main purpose of going there is a walk.
Bedford - I would go for the idea they propose of creating a new Midland station on the depot site, slightly closer to the main bit of the town centre than the present one (though slightly further from the bus station). This could allow St John's to be dispensed with (as it would be less than 500m away) and, with the time saved, could allow retention of Bow Brickhill instead. Could the Council be perhaps brought on board to look at making it part of a major redevelopment of that end of Bedford town centre, which can be a little rough - perhaps consider relocating the bus station and main car park too and redeveloping the old site?
So all trains between Bedford and Bletchley would stop 5 times? Seems an awful lot. And frustrating for long distance journeys (and times) in the longer future. For now, it's probably ok and may be a welcome change - but you'd want to overlay actual fasts in future.
The proposal is for 4tph, of which two would stop at Woburn Sands and Ridgmont (the ones from Oxford), and the other two would originate from Bletchley (ideally MKC post-HS2 in my view) and call at all (remaining) stations. I'd suggest a read of the consultation document I linked, it is very detailed on their proposals.