1) Yes, if Bell stays healthy I think he will beat the numbers you stated...1300 10-12 TDs.
2) Depends, Wheaton will likely only get starter PT if Sanders gets hurt. If Sanders gets hurt for an extended period of time he will beat those numbers. But, I just don't see enough balls coming his way. 38 catches for 500 ish and 4 TDs I think is where he will be.
3) No, not sure he even starts unless Worilds gets hurt again.