I was going to say no, he has too much potential, but none of those players are FA's in my league. What league size?
I'd probably still try to stick it out with Gortat for a while longer. Just because he goe to the bench now doesn't mean that will last. If he still is in a bench role a week or 2 from now and the Suns are winning games I'd drop him.
But Blatche is the best option until Lopez returns, and then I'd go with Kaman or Seraphin.