I'd be careful about assuming inevitability over such things.
The electorate is getting browner with every passing year- not only because of minority growth, but because some white Republicans are leaving for places like Nampa, Idaho and Provo, Utah. I don't think this trend is going to reverse itself anytime soon.
Obama may or not carry the OC in 2012 (although, as others believe, I think he would, running against Huckabee or Palin), but a Democratic victory is "inevitable" in the near-future... within the next 20 years, at least.
If all remains equal, that's probably true. But as all never remains equal over a period of that length, I don't think 'inevitable' is justified. Possible, yes. An argument can be made for probable, but inevitable is asking too much.
