I think all suppliers will oppose it. Imagine how many suppiliers of third-party and aftermarket parts there are, but of course, it'd be good news for the manufacturers and dealers.
Think about those people running classic cars from brands that no-longer survive or no longer produce the parts.
Eg if you had a Triumph, and something went wrong, you couldn't just go and buy a third-party replacement part and fit it yourself, you'd have to find an original part via a dealer and get them to fit it. Hang on, there aren't any Triumph car dealers around are there?
And with that 10 year rule, even if you were running a fairly recent car, you'd have to replace it with a new one whether you old one was broken or not. That would wipe out the Mk1s and Mk2s straight away.