I see a lot of complaints here about the size (trend) and lack of smaller, SE-like option. But if product cycles really do take around 3 years (from conception to release), then 2019 might be the year. The SE was released in 2016 and was supply-constrained for quite a while. Obviously this is pure speculation but if Apple was sufficiently surprised by its success, maybe they decided in that year to "completely re-imagine" (sorry :) that form factor. And retiring the SE this cycle, given the apparent absence of good alternatives in the Android camp, might store up some demand to boost next year's sales. Like I said, pure speculation, but I wouldn't give up hope just yet.
[addendum: I'm just listening to the latest ATP podcast episode to put myself to sleep, and lo and behold John Siracusa takes pretty much the above position while Marco Arment takes the opposite side. So now they've got a bet going on. Fun little coincidence. Check out the podcast if you don't know it yet, it's right in the ballpark for people who would comment on this article.]