That's exactly my plan also.
Here's what I think (Warning -- rant ahead):
I realize that the "dedicated followers of fashion" among us think that the Apple-esque dumbed-down crudely rendered esthetically offensive UI is just great. My thought is that it looks like something that one would see on a $20K car -- cheap, cheap cheap. It's the kind of work that had its genesis in the efforts by Apple to appeal to semi-illiterate teenage smart phone users --people who are uncomfortable with text, letters and all that other hard stuff, and who wouldn't know a design element if it bit them on the ass.
Think that's too harsh? Well, let's talk specifics, ignore the 17" screen and just focus on the "instrument" cluster.. First, while the individual elements vary in importance, we use every item of information which is presented on the present screen. The new interface removes some of those items completely, hides others and inserts a cartoon car in the middle of our vision. First, we already know what color our cars are. Second, we already have turn signal indicators which are far better that what is offered in the new interface. Third, we already have a headlights-on indicator. Fourth, we don't care when our brake lights are on (what could we possibly do with that information anyway). I could go on....
The overall effect is to compete for our attention with shiny fluctuating lights, distracting us from the few remaining useful items of information which survived the purge.
My wife and I have done "show and tells" to several thousand people over the past three years, but that would come to a sudden halt if we were forced to show the 7.0 interface. It would be so much like the slapped together amateurish displays on a super cheap car that would be just too embarrassing.
I would regard Tesla forcing this upgrade on our Model S cars and removing information displays that were part of the purchase of our cars as vandalism, just as surely as if they removed the sun visors just to get a smoother look in the interior. Regardless of what Tesla thinks, we paid cash, have the titles and OWN our two Model S Signatures. When Tesla offers upgrades that we believe are useful, that's fine, but when they attempt to take away elements that are part of the cars we bought we have the right to refuse.