ricklewood has suffered as a neighbourhood as a result of two main factors: (a) too much traffic - on both the A5 and the roads linking Willesden Green with Golders Green
I honestly don’t think those roads are that bad (apart from A5 around Staples Corner).
The main culprits are, IMO, the railway, cutting it in half, the A41 cutting it from a nicer Child’s Hill / Golders Green area, and A406 cutting it from the areas to the north, including the shopping centre. All combined, the made the area around A406 quite badly accessible without a car. Now, with the new station, the regeneration area to the east of the railway is much better connected. The connectivity of the area to the west of it, though improved, is still far from ideal.
(b) being divided between three different boroughs, none of which have shown it much care until quite recently (and arguably only of the three then)
The part to the west of the railway, especially the bit of Barnet between the railway and A5 - yes. The part to the east of the railway are fine from this perspective IMO - it’s Barnet fair and square.
I am wondering though which council you’re referring to when you say that one started paying attention
I'm not at all convinced that Brent Cross shopping centre, unless it undergoes a comprehensive (and creative) reinvention, has much of a future, at least not in its current form.
I think it has its use. Yes, it’s heavily car-centric, but it’s probably in the best location for a car-centric shopping centre - next the A406 and M1. Sure, it doesn’t target central Londoners who would rather go to either Westfield by public transport, but it has its own target audience.
It is smaller though than either Westfield, and consequently has a smaller variety of shops - this I think is the main issue with it, not access.
Anyway, when it comes to car-free access, I hope it will be improved once the people start moving into the new development right across A406 from the shopping centre.
With some imagination, the future of the area should be bright - it's well-connected, not far from Central London, and (via West Hampstead, at least) has excellent transport connections, and numerous very pleasant neighbourhoods are nearby.
Except that there’s much more than West Hampstead when it comes to transport connectivity of this area, as one can easily use Thameslink to get directly to Central London, City, Luton and Gatwick airports, Greenwich etc, or change to the Elizabeth Line at Farringdon. While West Hampstead can be useful for some journeys, such journeys are a minority.
Otherwise, I share this bright sentiment too!