This is happening because owners are not trading in.

The people who buy new cars are different from folks who buy used cars. They are less price sensitive and are likely to trade in their car every few years.

They are the ones that keep the gravy train running.

And now they can't get the "Free Supercharging" option, and aren't buying. So telsa is trying to help them out, while ending the free supercharging.

Personally, I think one other thing telsa ended is individual controls for functions like turn signals, headlights, wipers, PRND - that sucks more than losing free supercharging. (I'm not talking about touch controls)