What level of politicking took place for such regulations and scrutiny to be introduced mid-season? One can imagine...
Someone or some team must have been really curious to find out what RedBull are doing and used their influence to get the FIA to find out. Perhaps a team came to the conclusion that they would need flex floors and assume RedBull or Ferrari must already be doing it.
F1 has always been about exploiting the gray areas, it should not be hindered by cost caps or politicking. Mercedes got to keep DAS all year, so it's curious why some teams are allowed to keep their advantage and some teams are not. My initial hunch is Ben Sulayem is catering to Mercedes or "billionaire" Wolff. The FIA already reneged the second stay after Mercedes tested that it didn't help. Mercedes probably has a rear wing that flexes 3mm already, right? Why can't the regulations be updated to ALLOW flexing under certain conditions to reduce porpoising?
At the end of the day, brilliant minds like Newey will find a solution and the teams will adjust their spend to accommodate it. Gray areas in the cost cap will be found by all teams. Teams can leverage technology from other projects and racing series like Mercedes did with Formula E, etc.