Someone else posted this a while back, but I wanted to re-emphasise it: GaaS is a continual loop; if the game sells poorly at release but you're planning a true GaaS then this should not affect your road map. if you react and start dropping content planned then you will only be telling people never to buy your games again, as you don't support them.
Personally I'd rather they doubled down on BFV, pumped out more content and released a new BF title not before holiday 2021.
If they had given Battlefront 2 proper GaaS support after all the controversy and poor sales that game went through then I would have faith in EA, but its like you say, once that trust is broken its really hard to buy another GaaS product from the same company/developer.
Expansions are only bought by a fraction of the original owners. They did the right thing with a major release. They chose very very badly with the P2W.
The mistake was dropping support for that game.
The team they left to handle that game is so small they can barely keep up with the bugs.