So to summarise, firefox for android will stop existing and you will not commit to saying that whatever you replace it with will have addons.
You imply that this doesn't mean that it will not, but also not that it will. What you will say about it is that addons are hard.
Taken together, those statements don't exactly foreshadow good news.
So the question is whether or not Fennec's replacement will support add-ons when Fennec finally hits End of Life. And I know this sucks as an answer, but we're not yet ready to make public commitments on that front. That's not because we have bad news hidden up our sleeves, it's just... we're still working and designing and figuring this stuff out.
If you want to know more about the architectural mess we got ourselves into, and how we're extricating ourselves from it, I highly recommend reading through this internal presentation on the topic: https://docs.google.com/presentation/d/1MzU9q2wCwojC0kb1eVfm...