PT voters have already expressed their dissatisfaction at the party's u-turn, and 3 senior PT politicians have repented (as a gesture) by resigning their party posts - but not their new jobs as ministers, or even as MP's.
The first thing all the political journalists and academics are commenting on, is the fact, ministries have been divvied up to the various coalition factions, based on political power. Not based on expertise. PT don't even control all the finance ministries, so their plans could be scuppered from the outset.
However, there seems a consensus that a reshuffle will take place as soon as realistically possible, putting the right bums in the right seats, or at least trying to, so for example, moving an army general away from education, and presumably, to remove the convicted drug dealer just away.
MFP and it's supporters, would be best to sit by quietly and allow the spectacle of the new Government failing, because of inertia within the coalition - should that happen. They will then be in a position to mop up at the next election, if that is ever allowed to happen.