I'd want someone secured as a 2C and fine with Tavares as 3C.
You would be "fine" with the guy currently 23rd in scoring for C's, as our 3C? I mean I get he's likely to decline over the next four years... maybe he'll even decline into the production area of other 2C's.
What you really want, is a 3C, who is a higher end producing 3C... funny enough, Domi is 48th in scoring for C's... actually producing like a middle tier 2C. I'm not saying he's the answer in anyway... but we've got the situation you are looking for already.
While not quite as productive as Domi this year... or well, ever for that matter, Michael McLeod is an upcoming UFA. He's got a lot of characteristics I'd love in a good 3C. Size, physicality, 66% at faceoffs this year, and he's got 18 points in 38 games... so 70th in C scoring... kind of high end 3C production. He's also only 25, and I believe has room to grow his game. Not the be all, and end all stat... but he's the NJD leader in +-... plays some PK, no PP time at all.. He's tied for 50th in Even Strength scoring for C's. Now, it would be a misstep for NJ to not extend him.... but he's the kind of C you'd want.
If we get lucky... it might make sense to sign McLeod, and keep Domi as well.... if they would sign to contracts that are reasonable. Domi LT at $3 mil is a good deal, and McLeod at $2.8 for 3-4 years would double his pay, and still be reasonable. Might have to move Kampf for that though.