His salary would be sky high.
It would take years for his salary to get so high that he cannot afford him, and by then, if he's not moved up in divisions and making a lot of money, something is wrong. I've played only one full season and two partial seasons, and I'm able to afford a $50K salary player and still making $100K profit each week (though I suspect that will go down to about $70K soon).
And even in D5, I was able to afford a lvl 4 trainer, so no reason this team can't afford one right now, too.