I have seen this before somewhere, it was actually a product that was produced.
The problems were many though.
Firstly, getting that clear film onto the windows with no bubbles or dirt underneath is nearly impossible. Ever tried putting a screen protector on your mobile phone? I have and it is very difficult, not to mention time consuming. The tiniest piece of dust causes a very noticible bubble. Imagine trying to do that on an entire window, and then on an entire house of windows. You'd need to get someone either with special skill or with some special equipment.
Secondly, tearing off. Not as easy as it may sound to get just one layer off. And by the time you've got your ladder out to carefully try to tease off just one layer without pulling the others off or getting any dirt under the other ones, well you might just as well have taken an applicator and squeegee up there and cleaned it traditionally.
Thirdly, film, like cellulose film, discolours to a yellowish tint if left exposed to UV for a few months, and who wants yellow light coming through their windows?
I would argue that rather than tear-offs, it would actually be easier and much cheaper to simply buy a ladder, applicator and squeegee and clean them yourself conventionally. House owners can already do that if they don't want to employ a window cleaner, but most don't.