Perhaps pay-per-episode with a discounted price for an entire series (and an option to buy the remainders taking that into account). It seems fair to be able to dip your toe into a series and try a few episodes before committing. On the other hand, that seems just a bit too consumer-friendly...
For the subset of Amazon-available content that isn't counted as Prime Video I think yes, but not for the rest of it. Apple TV+ possibly too, though they also have what feels like their own confusing model that shows some things as being available with the caveat that it's actually available through either a) a proxy with a subscription to a third party or b) a one-time purchase from them. I'd hate to be in the meetings where the details of these licensing agreements get hashed out.
I was thinking along the lines of how much I actually watch, if I only watched 10 minutes of your show, I only pay for 10 minutes, not the entire thing.
You're also saving on bandwidth.
Paradoxically, I'd still want to pay per minute of viewing time, if I'm watching the show on 2x the speed.