Trading Turris could be shooting yourself in the foot considering future negotiations.
"We would like to commit to you long term"
"Yeah, just like you did with Kyle Turris, eh? I'm not sure..."
That being said, assuming he'd be ok with it or even want it and Fabbro impresses this spring, then I'd move him and Subban in two trades in the offseason or draft. This comes with an assumption that we have traded for or signed Duchene, too.
Subban
for
futures if we sign Duchene in offseason (assume Tolvanen to compete for 2nd line RW then) / RW if we trade for Duchene at TDL (assume Tolvanen being part of the trade for him)
Turris
for
Faulk (he has one more year left, making him a perfect stopgap)
If Fabbro is not as ready as we hope, then trade Turris for say Demers (has two years left). If he improves drastically in his first year, then just play Demers in the 3rd pair for the second year. Not a big deal since Fabbro would still be on his ELC.
Canes and Coyotes picked because my limited knowledge says they might be interested in Turris and would have a place for him in top6 and they have fitting defensemen that could be had in a deal involving Turris.