Coming back down the road is ok. Coming back and being a raving lunatic that is disturbing to look at isn't.
I don't see HBK coming back at all. Judging from the interviews he has been giving lately, and even what he says at the end of his "My Journey" DVD I think Shawn wants to go out on top, and not ruin the sure to be fantastic send-off that the WWE should give him. I truly believe we have seen HBK's last match, and if we did, 1: What a way to go, and 2: Thank you HBK for the memories.