it certainly seems that they've switched this (in the correction of the promises/never playing in a game thing, i guess) so that there's no leeway at all.
I had a guy quit over similarly small minute issues last season for the first time in ~140 seasons of coaching. I didn't quite get to his desired level, but his WE only dropped a little (say 5 points), so I thought he'd stick around. He certainly would have 90% of the time before. Will need to monitor this stuff closely going forward, or there will be tons and tons of transfers. I'd guess this is another in a long list of overcorrections. There's no way to get every Soph 10 minutes and every Jr and Sr 15+ every season.
And yet, oddly enough, i forced a RS on a guy last season, his WE fell to 1, and he stuck around. Hmmm.