Not lots of,a few, 9-10 maybe.
I would totally love that personally!
In Oblivion, the feeling when you spotted an oblivion gate in the wilderness, especially at night, was magical. But they're totally not gonna do that in Skyrim, people would complain so much. At best we'llget the quest described above where under special circumstances you're allowed entrance to a limited part of an Oblivion realm for a short time.
But yes, I would love 10 Oblivion gates in the landscapes of Skyrim. :rock: