I'm not following, how has it "worked out"? We haven't really done much as we haven't the cap space to spend, unless you call signing guys like Domi, Bertuzzi, Reaves or whoever else as major moves so not sure what you mean.
Why stop there? If you consider almost winning to be an accomplishment, you could go on and on and on about what this group has accomplished over the years.
IMHO, the biggest reason we can't get over the hump is our legendary inability to score goals in game 7. Hard to blame the goalie when you can't score and I don't know how you can blame the coach when the players keep playing poorly in game 7.
Based on recent performance, bending over for Marner or his dad or whoever is making decisions this time around would be blowing a defining moment. Save the cap space for something else, maybe it works out and maybe it doesn't (there are never any guarantees no matter what) but the chances of success while spending a ton on Marner seem pretty darn slim to me.
If Marner kills it in the playoffs next spring, that could change things but as it stands right now, I'd rather bet on someone else for a change.