Like everything in life, the context matters.
-Generally speaking, you will almost always have 57 scholarship players on your team, so the scenario where you sign 28 guys and still don't have 85 scholarship players is somewhat rare. What we saw this year on our own team was pretty close to the limit, but rarely does it get much worse than that (UNLV sounds like a mess).
-I'm not entirely sure about this, but I think the limit on backloading to 25 + 3 is Big Ten rule, not a NCAA rule. In other words, you can only sign 25 guys per academic year, but you could charge 8 players to the previous year, so long as you are still within the limits and your conference allows it. Miami, for example, signed a class of 33 players this year, so there has to be some flexibility there depending on the conference.
-For our own team next year, we will have well under 25 scholarships (looks like 12 seniors on scholarship, depending upon walk-ons like Austin Hahn). So, we could lose 5-6 guys to natural attrition, which is an entirely natural thing (depending upon which players, and why). Just like people looked at our quarterbacks and assumed one of them would transfer (Parrish..and Pride, if you count him as a QB), I think it's fair to look at some other positions and at least see the potential for the same thing occurring.
-We have, for example, 5 sophmore wide receivers under scholarship next year (Crawford-Tufts, Jones, Fruetche, Wilson, Hutton). While the first three seem to have a good shot at playing time, I think it's fair to speculate that the Wilson and Hutton are looking at long odds (not recruited by Kill, didn't play at all last year), especially with the addition of McDonald and Harbison. They may be fine with that. They may change positions. Or they may end up being tremendous special teams players. I want to be clear that if they want to stay, so long as their grades are fine and they stay good with the law, I want them to stay too. I would never advocate kicking a player off the team for performance issues. But, if they want to play, they've got some work ahead of them. You could say the same thing about our offensive line. We will have 12-13 sophmore and freshman offensive linemen next year. Because of the nature of the position, only 7-8 of those guys will ever be part of the regular starting lineup. It's a safe bet that all 13 of those guys won't stick around for all 4-5 years.
-Eventually guys will transfer. It happens in every program. You just hope that they do it under good terms and of their own choosing.