People have been asking/demanding a la carte pricing for cable for years... looks like they're getting it now, but in the streaming world. I could see this really working well if the prices were targeted toward a la carte style. If Netflix lost most major movies but had original content and B style movies and maybe classics but was $4.99/mo I could see lots of people keeping that. If Disney was $4.99 month and gave you Star Wars, Marvel, Disney Channel TV shows and old cartoons and stuff, I could see that. If ESPN was $4.99 to $10/mo or something (Sports are always more expensive for some reason...) that could work...
ABC, NBC, Fox, etc would probably need to be down near $2.99 or $3.99/mo each or something and maybe still have ads. Or partner with someone like Hulu or YouTube TV or something and bundle those plus extra channels (Food, Syfy, etc) for $20 to $30/mo it might all work.
If you wanted everything sure, you would be back up near $40 to $60/mo. But if you just were a Disney fan and standard TV style stuff you might be down near $35/mo. If you just wanted old movies, Netflix originals, and sports, maybe $15 or something.
I hate to say this, but it's almost like they need a cartel or something to fix the prices on all the options. I think if each guy thinks his service is the best and "worth" high end prices (which come on, when you've got share holders of course you're going to value your service high) no one is going to be able to pick up more then two or three streaming services (at $10+/month each). However, if you had someone that controlled those prices and basically packaged them into groups (but still allowed them to be bought one by one) the prices would start to fall in line with what "made sense" and then each individual could customize their personal cost based on their desire.