What do you mean "waste"? Tua and these same receivers have already won one national title - the first year they played together mind you - and lost the title game to a 15-0 team in the 2nd year. I'm not happy with the defensive results so far either, but saying we're likely to "waste" our offensive talent is a bit much in my opinion and at least Tua & D. Smith are already "immortalized" for what they did to UGA.
Our biggest issues on defense are (1) obviously the youth in the middle, and (2) our offensive style is keeping our defense on the field a lot. Regarding (1), I'm seeing a lot of overrunning plays, poor pursuit angles, lost containment, etc. - in other words, stuff that only gets better with experience. We're a tad slow at MLB, yes, but otherwise I'm not seeing "ability" problems for the most part, but experience problems. Regarding (2), as an example OM ran 88 plays today. You're going to give up some stuff when you're on the field that much, but geez we had 38 pts at the half and averaged about 3 minutes a drive on O. Something had to give. Before today, we were averaging about 4.3 yds per play on D. Not elite, but still good enough for 15th in the country (by the way, ahead of that mighty front 7 of Auburn at 30th, averaging 4.7).
I believe it will improve with the caveat that we don't have any more significant injuries in the middle of the front 7. It's not up to Alabama standards, no, but it's also not the disaster some are making it out to be. To complement the youth on D, we would ideally run a grind it out ball control offense to help them out, but that would be insanity considering the truly GENERATIONAL talent we have at QB and WR this year (and the RBs are coming on too from what I saw today). With a little injury luck and some growth in the younger players, this defense is still good enough to win the CFP when we can score like we can right now.