Such a thing could be implemented, but I can't see it being accepted by a majority of peer nodes. My opinion is that we should not monkey with the code to accommodate human nature. If someone can't get their head around the fact that price is irrelevant then they should trade beenie babies instead.
The attitude of "if you're not smart enough, then f@#k you" is not the way to go. If you want Bitcoin to be successful then it's going to need to be made easier for people.
I think we need to unify around using mBTC instead of BTC, that's the simpler solution compared to a "stock split" type option. We may need to split eventually, but it most likely won't be necessary for a long time.