But BF2 has got some nice updates over the last few months, right? I know the game isn't getting updated as frequently as it should be, but I think that it's in a pretty good place right now (from a technical/gameplay perspective). There'll be a new season with Obi-Wan, Anakin, Grievous and Dooku, a new map and I heard that they're also working on a lightsaber rebalance update.
If the release of BFV doesn't meet with a huge community backlash (as it was the case with BF2) and the playerbase doesn't significantly drop all of a sudden due to external issues, I assume there will be a lot of developers working on post-launch content, even more so than in the past, since Battlefield has now moved on to the live service business model. Obviously I can't tell for sure, but I think you will be getting a better value with BFV than you did with BF2. And unless the latter unexpectedly makes a 180 u-turn or finds a way keep and gradually grow its playerbase (see Rainbow Six Siege), I don't think there is a high chance for higher number of developers working on it again.
At the end of the day, I just hope that EA/DICE learn from their recent mistakes and put a lot of work into future Battlefront and Battlefield titles to show the playerbase that they're listening to them, at least to some extent.