GS Penalty
Even with the tweak you propose, this is clearly not enough as impact on the results since GS is back good after 2 weeks at most. IRL, it sometimes take months or even years to build a fine chemistry.
Fan Boycot [...] Fan Survey...
No direct impact on a game outcome as far as I know (or really low)... once again only a financial impact. What’s more, a new transfer is rarely something bad for the fans. The problem is the repetition of transfers!