On the most recent episode of his podcast, Stone Cold says that he will NOT be wrestling at WrestleMania 32 in Texas or probably every again (Link to his Podcast). He directly says that "my heart is not set on wrestling again”. And if his heart is not set on it, than no amount of money would make him change his mind.
Obviously disappointing news as a Stone Cold fan and as a wrestling fan. Having him wrestle one more match at WrestleMania 32 in his home state would have been phenomenal. If his heart is not in it though, you can't blame the guy. I believe his last match was against The Rock at WrestleMania 19, and that's pretty hard to beat!