No it isnt. Apple will not produce more 4's. The ones on sell now are production lot's remainings. The only reason "apple can offer them" is because it wiser to sell them than to throw away.
And people don't have a choice in size. They have a choice in sie that goes MANDATORY with other specs, such as slower CPU, less advanced OS, less functionality, heavier/thicker device, have they decide to go with smaller screen.
You clearly have no understanding of Apple's obsessive degree of supply-chain control.
The 4S is likely to be still for sale for two more YEARS. You think Apple just accidentally made a two-year surplus of the 4S, and now they are stuck with them, so they have to keep selling them? The actual figure is probably more like two days than two years.
And people don't have a choice in size. They have a choice in sie that goes MANDATORY with other specs, such as slower CPU, less advanced OS, less functionality, heavier/thicker device, have they decide to go with smaller screen.