If Robbie Cano was a smart businessman (and I'm assuming he, other players, and all their agents are) and realized the present value of money concept and wanted a front-loaded contract....is there any doubt there would be suitors? Some would back out, surely, for inflation reasons, but not all. Someone would do it. After all, the "agency" in determining the terms of contracts lies with players first. It's up to teams to play their game and how much to play it. But if Cano and the rest of the players suddenly decided that they wanted front-loaded deals to get better value out of their contract? Teams would cave.
But we don't see that, meaning the impetus is on players - they've decided those terms aren't to their liking. Part of that is union pressure to avoid low yearly salaries that may (probably wouldn't but it's their concern) impact negotiations. And the other part is ego - they want to be on that list of highest paid. They don't want to be left behind in terms of yearly salary.