All in all, saying that "Facebook is going to dethrone Google" sounds to me as saying "Somalian pirates are going to defeat US army and then dominate the western society."
Facebook: blah blah dominate blah blah
Google: yawn (removes Facebook from search index)
But to stay objective, Google should seriously do something about the abomination named Orkut, which runs on
Can't believe the licensing option wasn't mentioned more in this discussion - if you've got a killer IP, then approach the MegaCorp's competitors, and offer non-exclusive licensing deals to the MegaCorp *and* their competitors, at the same time.
That will make them think twice about developing the product themselves from scratch and losing the edge during that time.
Put the first money you make towards a patent application, assuming you are a prior (first) art.
Don't sell out in these times, if you've got a place to live and something to eat, the money is just a piece of paper. Money can dramatically devalue from one day to another, MegaCorps can fall or downsize to the bone.
It all depends on whether you really believe in your idea.
On a more serious note though, maybe now it's the time for the company to do the right thing and open source / free domain the game for everybody to finish. Even if in the form of a Quake3 mod, or based on its engine.
And don't be so sure
The reason we are in this mess is allowing of sub-primes to the general population, relaxing the the debt-to-net ratio for some institutions from 12:1 to 30:1, not regulating predatory and misleading lending practices and because credit default swaps were explicitly NOT regulated.
And logically, I think the next question is: Was at least one of the above points done with the intent to actually create the current crisis?