Man, that would kick ass! If we found out he was here, he could tell us anything and everything about his Ghostbusting ideas, concepts, ect. One problem would be, it would drive him insane.
It's like Trekkies finding out that Roddenberry didn't die, but was hiding out, and was on a Star Trek board. First off, people would expose him, next they would ask him so many questions, that he'd wish he did die.
Aykroyd, if you are here, don't show yourself, unless you want to comply with the concequences.