Little is a key piece that we don't currently have a replacement for, even if we draft a C top 10 in this year's draft. Roslovic might be a solid C prospect but he's not at Little's level yet, and may not get there. I like depth at C.
I'm not too worried about Little's production into his early to mid-30's, but I am concerned about his recent injury history. But that's a bit of bad luck vs being injury prone, imo.
$33 million over 6 years sounds about right.
Edit: I don't see Perreault (injury prone and not as productive) or Petan (still has bad jr habits and not productive enough) as legitimate replacements. Now if Chevy has to trade Trouba, and a young top 6 C is the return, then Little's replaceable obviously.