It would also be, to me, the ultimate reward for fans of the companies that actually have a bunch of Turbo CD laying around. You can be the coolest kid on the block again by being the only person who can run "that whys game with the red haired guy" in its full CD audio glory.
Therein lies the problem. The library of games still in playable format is probably very small. It also doesn't make sense that they would cater to this very small (potentially) user-base by letting them play their CD on the unit. I really don't have any idea how many playable copies of these games are still in existence, but I think saying 1% of the library being in this condition is pretty generous.