49ers mail call:Mike from Palo Alto, California, wants to know if I think Mike Iupati will be re-signed by the 49ers in the next year.Bill Williamson: It's going to be an interesting situation. Iupati is entering the final season of his contract, but so are Colin Kaepernick and Michael Crabtree. The 49ers want all three players back, but that may not be possible. Iupati has a big reputation and he could be facing a massive contract. If the 49ers can't secure, he will easily get it elsewhere in 2015.