wow some of you really do not know what you are asking. You keep Keenum and draft a rookie QB, you are looking at a possible losing season, again. Andrew Luck or Russel Wilson is not in this draft, not even close.
Rivers is under contract for 3 more years and already has his money of 39 mil from San Diego. I'm not gonna get into the whole cap number game, I'll leave that to someone with more time on their hands, but if the Texans wanted to win now, as in next year, you hire Whisenhunt and you find a way to get Rivers in a Texans uni.
He is 32, could have him for next 3-4 years and find the future QB with in that time frame. He is still got an arm and can sling it all over the yard and with him throwing to AJ and Hopkins, you are asking for a winner. SD is a hell of allot closer to rebuilding than the Texans are, so you could package a nice deal to win now.