I'm not going to flip the big man panic switch for next year just yet. Yes, it's absolutely true that Temara and Relvao are not ready to be regular contributors at the A10 level right now, and if Jenkins were to go down with an injury, we'd be in big trouble.
That said, bigs are funny. They suck right up until they don't. Bigs often don't develop the same way as guards do, where you can see them getting better and better. Bigs sometimes improve under the radar, right up until the point where they reach a critical mass of improvement where they tip from "not effective" to "effective".
I remember it most clearly with Hibbert in college. He sucked, and while he was making progress, it didn't change the fact that he sucked, he was equally ineffective. Then, he improved his hands just a little bit, and all the stuff he had been improving suddenly became important, because he could utilize it. His lower body strength, and improved footwork, and improved conditioning hadn't mattered, because you can't use any of that if you can't catch the ball. When his hands improved just a little, his production skyrocketed.
My point is, Temara and Relvao are freshmen, and while they both may suck at the moment, there are things there that, with just a little tweak, you might have a player. If relvao just picks up an 8 foot jumper, suddenly that sweepikng hook of his becomes a weapon.
If Temara gains a little bit of upper body strength, his spectacular lower body strength and athleticism suddenly make him a viable rim protector and rim diver on offense.
Give them an offseason. I think they may be more ready to go next year than people are thinking.