A couple weeks ago i was watching Spice and Wolf 2, a show i had been anticipating for a while and was so excited Funimation was streaming it online, until it expired.
Instead of rotating your online viewing library, why not show a static list of shows and expand that list periodically?
Have an online Queue that a subscriber can use to "checks out" a limited list of shows from Funimation's large and growing library but the trade off is they can't watch anything that isn't on a basic list until they remove a show or two from their Queue. The idea is like one is borrowing a few books from the library but returns them later to check out other books.
Also I noticed the payed subscriber gets access to a lot of behind the scenes stuff with the voice actors and stuff.
I really don't care too much about any of that stuff and would totally be willing to trade off that access for more access to more anime shows. No offense honestly, i'd just rather watch more of the shows the voice actors lent they're talents to.
Maybe different levels of subscriptions can be made to accommodate this. I would be willing to pay more because of all of the content that funimation has released in the past and is constantly releasing in english, but only if it was accessible via the TV ala PS3.
Honestly i would be willing to pay 20 bucks if not more.