Unified belts...Good thing??

I was wondering. If Vitor/Randy fight Silva and one person is crowned the unified champion. Is the new champ going to defend both belts? Or will he have to give one up? I think it would be hard to jump back and forth between Pride and the UFC to fight. Not to mention we would only get to see 2 maybe 3 championship fights a year instead of 4 to 6.

Your thoughts?