I don't think Rodgers has lost any motivation. I think the messed up thumb has more to do with his inaccurate throws.
And he doesn't have the timing down with his WRs. Other than Cobb.
Doubs and Watson have been in and out with injuries, and that hasn't helped.
Sitting Rodgers now will slow his development with the WRs, IF he plays next season.
If he is going to retire, then I'd say play Love to see what he's got.
But truth is, any thoughts of making the playoffs is over. They are in too deep of a hole to dig out