Revan didn't destroy Taris, it was Malak.. Just saying.
Also, Obi-wan Kenobi and Yoda also disappeared at the moment of their deaths, yet it is generally accepted that they died (minus a little force ghost action). What makes you think anything different will happen to Revan?
I'm not trying to destroy your theory, but I beleive that if something like this is to happen, it needs to be questioned, prodded and poked so that all possible plot holes are filled.
I like Revan, he (along with Darth Bane) is one of my all time favourite characters, and i do want to see a return, but only if it is a dignified one with a good point and story. Not some cheap reference to keep us happy.