BYU has always played these G5 level teams and Wilson AND Allgeier have looked far better than previous BYU QBs and RBs against that competition. Will it translate to success in the NFL? Who knows- because there is always exceptional college talent (even from P5 teams!!) that flop in the NFL.
I do think we see Allgeier on an NFL team in the future. Just like Wilson as a freshman, you can see the talent is there to be in the NFL. What happens between now and when he declares for the NFL will determine if he gets drafted and how high.