Assuming we were still gonna go with the plot of finding Luke in episode 7 it would've been really cool had he gone into hiding specifically to prevent the extinction of the Jedi, and that he'd been spending decades training new Jedi in secret after Kylo had destroyed his temple. Thus finding him would make much more sense since the resistance would have the potential of having other jedis fight on their side. Just makes me realize once again how much potential these new movies had, and how much that potential was squandered.