The quote is taken out of context somewhat.
Dana didn't warn Rich about anything. He simply stated the obvious. Rich will be in a difficult position if he loses the fight. He'll be #2 and 0-2 with the champ. So instead of having to win 2 fights to get another shot he'll probably need to win 5, or 6, or maybe it'll be 7 fights. By then Dan Henderson might have made 3 mw title defenses. I'm sure Rich prefers being the champ and having his next 5-7 fights all be title fights. There seem to be some cool perks that go with the belt. At the end of the day though he is a fighter. Win, lose or draw Rich Franklin will be fighting in the UFC after he fights Silva. He just might not be in the title picture for awhile. Which if your Rich Franklin kind of sucks.