The oldest B7TLs are a temporary fix whilst the issues of social distancing and higher PVRs are in place and the mmcs are working at Hinckley Point. When they return, which I think was confirmed by
@On the Buses as sometime in the summer, then the elderly B7TLs will head off and there will be a fleet that on most major trunk routes (Tinner, U Lines, plus a few others like the 27) will be pretty youthful. The only route which stands out is the M6 as being pretty frequent without having modern kit, and it seems that consideration is being given to that in due course given the demos etc.
The Glasgow fleet also has quite a number of ageing Tridents, B7TLs (incl some of the same batch already in Kernow) and B7RLEs and they are doubtless ready to get moved on. What the replacement and disposal/cascade plan is with those, who knows but given a number are Eclipses, I would be surprised if much does move to Kernow.
However, we should remember the amount of new vehicle investment during 2016-2019 was pretty phenomenal. Cornwall isn't fantastic bus territory; much of the PVR is often built around schools and college traffic. There are also plenty of other places that haven't had anything like that investment so it may be that Kernow will have to wait awhile. However, were it not for Covid, you'd have the oldest fleet being 16/17 year old deckers (excluding open toppers - they are generally a bit older); compare that to the days of scabby 25 year old VRs and elderly Olympians.
It's not great at the moment but needs must, temporarily, and it's a lot better than the dark days of First Devon & Cornwall.