I would say, with the old saying, "Better be safe than sorry." Draft a QB if the elite is available. No one can predict if Luck will be 110% better and ready for the 2018 season until around draft day. So if the uncertainty still exist, then pull the trigger and draft a QB until Luck is clear and you see him perform flawlessly in the preseason. In the meantime, you have a blue chip QB you can plug in if Luck is still on the shelf. If the opposite occurs, then trade the QB you just drafted for a bundle of picks for some needy team. Makes sense to me.