Mark, I see no reason why Regent would sell off ships, well, the Voyager and the Mariner at least, and I do still love the Navigator, just not most of the intineraries, been there done that.
Remember, Seabourn is redesigning itself and building ships that are STILL not even as big as Regents larger ships, they are close to the size of the Navigator. Regent has no reason to get rid of their ships, they are much newer than the triplets to my knowledge. Unless they started a whole new concept closer to large ship cruising.

I sure hope not. The size is what keeps me from Crystal with 1,000 plus pax. Are you saying that they should ditch what they have, and build even bigger ships?
Likewise, Silversea's newest ship is not as large as the Voyager or the Mariner. Their other "larger ships" are same pax size as Navigator (I've cruised them both and like them) I like the 700 size very much. Hate to see it go much higher, too far to get from one place to another, and everything just gets "larger" than I want! I'm headed for a Disney cruise with my grands in a few days, and will get my intro to big ships, even though I've booked concierge cabins with some perks, it is going to be a lot of walking on that big Dream ship!
I didn't take your post as negative at all, rather, speculative, and speculative is just what is, just chatter. We do a lot of that here, nothing wrong with it! None of us are in the "inner circle", so do speak, about Apollo and PCH.
But you are right, would be nice for an announcement from Regent about a new build. We hear about it here and there, but I'm waiting for an official announcement. I think it would breath new life into the line. My personal feeling about this business, you grow, or you get left behind. Nothing ever stays the same for too long. You snooze you loose.