It'd be one thing if Wright had a secondary pitch to lean on to gut through a few hitters when his knuckler disappears, but Wright doesn't have one. The second he loses the touch on his knuckler, it becomes batting practice. The problem is that it just goes so suddenly. If he could wing it through a few batters to let the bullpen warmup, it wouldn't be as much of an issue.
I was worried that Wright's ERA would trend back to 4+ with the summer heat and natural regression. My only hope is that he provides enough to stick in the rotation for the rest of the year. If he craters out, the season is over for the Sox.