This is going from "What" to "WTF" real quickly...
Nickel and Dime are personnel packages. They don't dictate the play call. You can play prevent with your base defense, you can blitz out of dime. So to be clear, are you proposing that when the opponent sends out 3 WR/4 WR packages, we should stay in our base more often? We should match up their 3rd or 4th WR with a LB instead of a corner or safety? That's what it sounds like.
As for the safeties staying deeper, that was our entire game plan against the Texans so that by itself doesn't indicate prevent, unless you think we played prevent for an entire game. And we only gave up 105 yards passing in the entire second half, so I don't really understand what the hell you're talking about.
The offense also dictates what our defense will do. You can't just blindly ignore what the Bills are doing just to play more base. On the last 3 Bills drives where they trailed by a lot, they threw 78% of the time, compared to 60% overall for the game. And again, they gave up 105 yards passing in the 2nd half. Those deep safeties also helped discourage deep passes. Overall, Buffalo QBs were 3 of 10 for 80 yards throwing deep against the Patriots. They were more successful with drawing ticky tacky penalties, as those deep passes also generated 4 penalties for 82 yards. Basically, we had more yards in pass interference/illegal contact on deep passes than the Bills actually generated with their offense.
New England Patriots 2016 Defensive Splits | Pro-Football-Reference.com
Those are the defensive splits. There's obviously variance when you're watching a game, but overall, the season numbers between the first and second half are actually quite similar overall.
There were also plenty of blitzes, and lots of whiffs. Both sacks came in the second half, as well as a few near-sacks where Taylor spun out of them. Taylor had several scrambles as well as another sack wiped off the books by penalty in the second half. But mostly, there were a ton of short passes where it's almost impossible to get any type of pressure or rush. 12 of Taylor's 15 pass attempts in the second half were short passes.
So I don't really understand what you're talking about. But it sounds like you don't want us to play the safeties deep, play more base and put LBs on WRs, and blitz on short passes we can't get to anyways. Sounds like a winning formula for the #1 overall pick.