I heartily disagree -- it's very short-sighted. If $750k is $500k more than he'd get elsewhere, he'll cost himself that money in just a couple of years by acting in a way that will make teams stay away.
What way is he acting? Adhering to a contract? At 26, 28 when hes out of contract, the big bucks aren't going to come unless he's got that level of skill. And to be frank, I don't think he has that level of skill.
Normally I'd agree with you, but this is athletics as a business. The vast majority of players are going to be broke after they retire. Get paid while you can.
Additionally you do realize that he could take the pay cut and go play at some place like the Timbers or something but that is no guarantee of success to a degree that would make up both the money hes lost topline and in terms of the time value of money. That's totally disregarding the very real possibility that he blows out his knee the first game back and can never play professional soccer again. The downside potential is massive for Mix, the upside is rather less so.