This is the one variable that isn't discussed too much. If the iPhone 13 128Gb currently retails at $599 on the Apple website, we can expect the 14 to drop into that price point after the 16 drops.
If the SE4 basically does everything the 14 does but with a faster A18 CPU then why not sell it for the same $599 in March 2025 while discontinuing the 14 half way through its final year as an official Apple SKU?
But that kind of move leaves the iPhone 15 as the red headed stepchild in the middle of the range with an A16, unable to access Apple Intelligence although it would have a U2 chip for precision device location while the SE4 might not have U2, or even U1.
It would make things neater if Apple were planning to update the entire lineup with a 14SE and 15SE, everything stays the same but it's got an A18 CPU with suitable binning - eg, lose a GPU for 15SE, and down clock with U1 chip on top for 14SE.
And they keep making the SE 2022 for another year until the 14SE just drops down into its spot next year.