It's a tough question tbh.
Frank Gore is a good improvement over Moreno, Thomas & Ingram, so you will be getting some good extra points in there. About Schaub, he is good to have for sure, but he aint a Rivers. I'm not sure how much Texans throw the ball this year. When Foster is ready, they will have two very good RB's (Tate played really great in both games). My point is, I dont know if Texans focus the offence this year on throws, or they mix it more.
As you only run 1 QB, then Cam Newton will probly take the spot over Schaub in some games - Play him in week 3 atleast, Jaguars pass defence is so bad, Newton will be a beast!
All in all, if you can get AP or Hillis instead of Frank Gore, go for it BIG TIME. If not, then the trade is still alright for you as Gore will make alot more than Moreno, Thomas and Ingram. I'd say go for it.