That is not feasible or desirable...and it would pretty much kill NES collecting as a hobby. There's a reason people pay money for CIB games.
Nintendo did offer new replacement NES manuals for years until their supply ran out...just like R.O.B. parts and everything else. They ran out and that's it.
Yeah...anybody who has any decent amount of money invested in their collection is going to be against it, and anyone who doesn't will likely be for it.
Right...if you could even manage to find out who printed the labels in the first place, do you really think the printing company wouldn't alert Nintendo to what you were doing?
In any event, whether collectors are against this or not, I really can't see any way that printing high quality repro labels would be cost-effective...if you need one so bad, just buy a better cart.