Dude ... all of a sudden have you just forgotten the '10 season? There are a number of things that can be quickly learned from it.
First off .... Morris easily proved that he could tackle. Not only could he tackle ... but, behind a very good line, he looked great! Is Morris playing great now? Not necessarily ... he's certainly had his issues ... but young players still learn and improve.
Secondly ... the '10 season quickly showed how medicre even an excellent D can look if there are tangible exploitable weaknesses. Specifically, Iowa got hit badly by the injury bug at LB in '10 ... and consequently Iowa's coverage by the LBs was mediocre AT BEST for stretches of the season. During those stretches ... the QB would ALWAYS have the outlet pass open. What we're seeing THIS YEAR is very similar to what we saw last year .... only this year we don't have the benefit of 3 NFL-ready D-linemen as starters. Heck, the situation is even worse this year ... because not only is there a bit of a drop with regard to the talent-level on the DL ... but also the DL has been pretty darn banged up too!
Now here's a news flash for ya. Alvis and Bigach have been getting A TON of quality reps this season. Furthermore, Davis and Gaglione have been getting a lot of quality reps too. Also, Carl Davis was generating a lot of pre-season buzz ... however, he hasn't been healthy enough all season to really give us a good impression of what he brings to the table. In other words, I wouldn't marginalize that young man anytime soon.
I'll agree that a few good recruits in the 2012 recruiting class could certainly give the '12 Hawkeye DL a nice shot in the arm. Heck, as it is, I anticipate that Darian Cooper and Jaleel Johnson will really help solidify the interior of the '12 DL. Furthermore, Alvis has shown flashes ... but he's also made obvious "young-guy" mistakes too. What I don't get is that you don't seem to recognize the fact that Alvis is only a SO ... he still has his best ball ahead of him!
The big question, as I've frequently written about, is that the DE spot opposite Alvis in '12 is currently a big unknown. Apart from Bigach continuing to play inside and out and getting reps at the spot .... I just don't see anybody who's able to play the spot at the level that we'd ideally like. That's not to say that someone won't emerge ... guys like Hardy, McMinn, or Spears might just prove to do just that. Or, alternatively, maybe a guy like Lohn or Ekakatie could nab the spot if they were to become Hawkeyes. I don't know ....
What I will say is that Iowa's situation on D in 2012 isn't nearly as dire as you suggest.