Need to draft (Or sign) an O.T. By the sounds of it, D-Mac will need to restructure his deal in order to stay here. I think the time is right to draft (Or sign) a starting Tight End. Gronk will be 30 next season. Despite yesterday, he hasn't shown the same quickness he once did. Team desperately needs to upgrade the D.T position. Get the next Wilfork along side Flowers (Who I think must be re-signed). I think Burkehead will be released in the offseason. He's injury prone and is a redundant player. Jeremy Hill is more than capable of taking his place.
Can't really project much about TE or DE until we have more information about Gronk and Flowers to make an informed prognosis. While it seems likely that the Pats could draft to both positions, since both seem fairly thin even if Gronk and Flowers both stay, we'll need to see how free agency plays out first.
The Pats appear to have already begun preparing for the potential departure of T. Brown (and probably Waddle). They signed OT Dan Skipper (6095/315) to the PS on the 8th (another Bielema/Arkansas recruit), and just yesterday signed Ryker Matthews (6054/320), who started 19 games at RT this season for Hamilton (CFL), to a futures contract. They also have Wynn, of course, plus Ulrick John (6057/310) on IR. John, who may well have beaten out Waddle for the backup swing-tackle spot before tearing a tendon in his foot late in Camp, might be re-signed for the veteran minimum.
The Pats now also have a few IOL backup candidates close at hand besides Karras (and Ferentz), with Jake Eldrenkamp (futures contract), Tony Adams (Psquad), Croston (Psquad), and Schwenke (IR).
DMac is highly likely to stick around whether he restructures or not, although I suspect he agrees to a one-year extension to lower his 2019 cap hit. The current secondary has become far too good, especially with the emergence of JC Jackson, to break up now. I also suspect that JMac will be offered a new two-year deal to re-sign. In terms of candidates to develop for the future replacement of DMac and Chung, the Pats have Melifonwu, AJ Howard (also signed to the PS on Jan 8th), and it's possible that Duke Dawson could be groomed for a safety role.
David Parry (6012/315), who was the starting NT for Indy for two seasons, was also signed to a futures contract on Jan 9th, and the Pats have DT Frank Herron (6033/305) on the PS most of the season (originally a 2018 UDFA for the Pats). They could also re-sign either (or both) of Shelton and M. Brown, probably for relatively low money. Getting "the next Wilfork" in the draft is highly unlikely to happen, but the team has some affordable fallback options, at least.
It seems highly unlikely to me that the Pats would cut Burkhead. He's versatile (running, catching, special teams) and relatively cheap (only $3m/year). Plus, the Pats have typically carried five RBs on the roster (including Bolden on ST), and even that wasn't enough in 2015. The Pats played one game this season when the RBs were White, Barner and Patterson, and I doubt they want to press their luck going forward. Re-signing Hill would only bring the RB count back up to four.
None of the above precludes the Pats drafting the BPA at any of these positions. It just means that they're not quite "desperate". They rarely are, going into the draft, and they've already begun building the 2019 off-season roster in advance of that.