At this point I would expect any future ‘SE’ to either be in the form factor of the 8, or else a new design (smaller but based on the XR) - I think the 5s design is now too dated to really be a viable option to base a new phone on. It’s not just the internals, the screen has lower saturation, there’s no barometer, there’s no Taptic Engine, there’s no room to include any of these things. I get the whole ‘cheaper basic use and compact’ argument, but I don’t think Apple wants to stretch the cohesiveness of its product line any further. Generally I’m all for options to accommodate all tastes, but I think Apple has to draw the line on stringing this design out at some point and now makes sense.