I don't think that would be the case. I joined a MINE run of LotA shortly before DT launch and the difficulty felt somewhat on par with Dun Scaith/Orbonne Monastery. I doubt we would see any more people ditch the raids than already do.
I do think though, rather than changing CT raids down to minimum ilvl or the maximum ilvl for when the raid was currently, they should be synced down to the middle between those two(so for instance, LotA would sync down to ilvl 70). I'm also not entirely against changing them into the 8-man form from the new mobile version and moving them into MSQ Roulette(along with ARF which really feels like belongs in there.)