*Membership spots not really limited!
How is that sustainable? Unless you're going to make something like "Hydra's Lair sponsored by Mountain Dew" work, the costs of running an MMO long term are too large in my mind to be covered by the initial price point.
The Lord of the Rings MMO has a mix of optional subscription and paid for additional content. If you wanna do any quests outside the main one once you leave the starter zones, you have to buy them. This has worked really well for the gane apparently so maybe Marvel will try that.
The lack of character creation, if real, will be a major problem though.