I'm sure people will be grateful to get something (especially for the sake of just having it), but I don't know how long it would keep people invested. I know a lot of people are antsy to see Wolf or Snake return, but you've also got a lot of people who are waiting for newcomers, especially since 75% of the DLC characters so far have been veterans, two of which semi-clones to boot (and no, there's nothing wrong with these characters, they just don't bring as much to the table as a veteran like Mewtwo). I mean, going back to an older reveal trailer, who was more exciting to see- Robin, or Captain Falcon?
When Roy and Ryu were revealed- or should I say leaked on my twitter feed- even though Roy's gotten more love from me, Ryu's reveal was waaaay more exciting. With a veteran, you know what you're going to get. And for some people, it's a lot harder to work up passion for that.
If 80% of DLC is just returning characters and 60% are semi-clones, people are going to be frustrated. And I don't feel like "beggars can't be choosers" is as applicable when it's our money that's paying to add characters to our rosters. If they were free updates, I'd completely agree with that phrase, otherwise.