I agree with you that there are a lot of holes. The offense wasn't good enough this year, either running the ball or passing. They can't afford to re-sign or replace more than one or two of Brady, McCourty, Thuney, and Van Noy/Collins, and they're losing major depth at IOL, DL, LB, and WR. Some of the solutions can be internal - maybe Froholdt / Cajuste step on the OL, Harry improves, Bentley steps into a big role at LB, etc. But there's a lot to do for Belichick the GM.
Where we differ is I question the whole idea of blowing it up for an NFL team. Yeah, tank in the NBA, sure, you've only got five starters and a superstar makes a huge impact. But football, with 22 starters and a bunch more contributors, you need a lot more pieces. Getting rid of effective players just means there are more holes to fill.
To be clear: I'm not on board with mortgaging the future to load up for a last run, either. Just make smart decisions, develop the young guys, hit on some picks, and make some smart budget FA signings (where they've quietly had a ton of failures of late). It's not high-percentage, but neither is winning the Super Bowl.