On the one hand we have the suggestion of converting 222s to "all electric" (removing the diesel), on the other we have the suggestion that there will be too many fast electric trains (so no need for any more).
Bi-mode 222s would suit the Paddington - Cornwall services (which will never be fully electrified) or XC.
Or even, if the link between Oakhampton and Plymouth is restored, a new route Waterloo to Plymouth. Which would remove the need for trains to "reverse" Exeter to Plymouth from Paddington using the new route.
Although that is proberbly quiet some time away as it would also require the building of Crossrail 2 and OHLE of the SWML from Basingstoke to Waterloo.