Their deal with Marvel Select was to produce a figure a month for three years. While they didn't hit the one-per-month mark, right now, if you inlcude the yet-to-be-released figures of Thor and Hulk, they're at 35. I hope 36 is the rumored SHIELD Agent / AIM Agent 2-pack.
As for MiniMates, I agree with what's been said above about it not being up to DST. They're not "giving up" Marvel -- it seems entirely up to Marvel whether or not they'll grant a license extension, and how much they'll charge for that license. Hasbro could lean on Marvel not to allow this, which would really suck.
I don't have much hope in Hasbro carrying the MiniMate banner... it's a smaller niche market, and they're already pretty over-extended with all of their channels... movie figures, Icons, Marvel Legends, the new Spider-Man line coming out, the 3 3/4" figure line to be announced, the 6" 2-pack series that will be announced at Toy Fair, SHS... I really hope DST can fanagle hanging onto this line, b/c Hasbro wouldn't touch it, even if they leaned on Marvel to nix it (either outright, or by making the license so prohibitively expensive that DST couldn't justify extending it).
And let's face it... to echo what has been stated above, Marvel does not want to piss off Hasbro. They know who butters their bread. Truckloads of cash from that partnership. Of course this is all speculation, and maybe Hasbro doesn't care about this license, and maybe Marvel thinks it's really cool and can see the value in competing in a market where DC has a lot of visibility as well, and the margins are pretty low for everyone anyway.