I had the same thought today, but I don't think I should ever sell off my collection. I just love the Turbo too much.
But I'll echo the sentiment: the Everdrive is fantastic. I've spent the last few weeks going through numerous PC Engine titles that I've missed over the years, using The Brothers Duomazov as a guide. As a result, I've discovered some great games. Even games that wouldn't be considered "classics", I've enjoyed the hell out of. (Coryoon, Aoi Blink, etc.). Looking forward to continuing the discovery.