If a company is going to argue that this would harm potential future re-releases of their games, they should be forced to rerelease those games in less than a years time. Otherwise it can be understood they have no interest in bringing those games back to market.
Allow libraries to do this for games that have no re-release, and have them remove the game from emulation options if it does get a re-release. Simple solution.
That's what I've been saying for awhile. If it's not readily available after a certain amount of time, for a certain amount of time, emulation should be 100% legal. Sell it to me or fuck off.