Nope. The stratification of where Cousins may be too good to bench, but not good enough to win it all is too big. Players, fans and some coaches would be calling to keep Cousins just to watch entertaining football, but at the expense of figuring out a long term solution, which was the path they committed to when Cousins left. I'd rather lose ten games with McCarthy than win ten games with Cousins, simply because to someday win a championship, they have to figure this out.
Even if Wentz plays well enough to win games, we're way less likely to have that problem.