I've always wondered how he felt about it---seems like he's taking the joke quite well. He even said himself that, coming from a modern-day perspective, it's pretty "naff".
I think he has put it exactly in its appropriate cultural place. He's not gonna try to cash in on it b/c "it's really a young person's thing, innit?" Bemused, puzzled, but cool with it.
Yeah, I'm a Rick fan. I ain't ashamed. (well, maybe a little.)
I used to go see these guys in Southern Minnesota, and the band leader "Chainsaw Kaine used to bring out a REAL chainsaw and cut the head off a lifesize Rick AStley carboard cutout. It was AWESOME!