Change my wardrobe

- even if I do it these phablets won't fit. Why should I replace my wardrobe to accommodate the short-sighted mega-corp?
The large company selling 4" smartphones - Apple.

Who are these
"People" you talk about? Three of the four iPhones in my household are 5S/SE models. All the SEs were bought in 2018 second half.
Apple supports all of its 64-bit iPhones today - that starts with the iPhone 5S! Even if

wants to ditch the 5S/SE line, they will have to specifically target their oblivion in the code they write for the iOS that retires them. In this mix - the iPhone 6S.
So, the iPhone SE is NOT outdated. It can last as long as the user wants, if they do not update the iOS - say from iOS 12.
If Apple never releases another 4" model, people are going to cling on to the current models until … no, the "cold dead … " doesn't apply here, but the gist is the same

.
Remember, people are still buying the iPhone SE as of last night.