Wiser to just whine about it here. There's really no productive way to have a conversation about this subject - they're either into the dynamic or not, and bringing up the potential for a swap will result in an unenthusiastic and quickly dropped thread. Expressing dissatisfaction with the status quo won't make them suddenly eager for something they're obviously not into, so why bother? It's the false promise that bothers me the most. Just be honest that all (general) you want to play are subs/bottoms. It's not a big deal, 99% of people who are willing to dom for a switch would be willing to dom for a sub, and this way no one ends up disappointed.

It's totally fair to be burned out on the CR while still not wanting to let it go, because finding a decent sub/bottom is only slightly less impossible than finding a decent switch. Give the line a break, and if you want to be petty, start publicly fishing for a similar dynamic with other people. They'll either get the hint or they won't, but at least you might end up with a fun thread.