Oh, i didn't wanted to stop development, i will stop only when i don't enjoy adding to it anymore. What i did lose was, in fact, the will to share updates, as the mentioned user (as well as one or other, in a lesser way) kept making false facts about compatibility, or interpreting the news as magical instantaneous additions to already released versions, which kept being mildly annoying after a while. There's even a new peripheral support added to it and it was fun to see it working, as it could be a cool addition for many players.
Yeah, even if it runs full speed with a whole lot of games on the Wii, playing it on the Wii U is indeed a nice way to push the "almost perfect" games list to the max, for those titles that need the extra grunt. I do enjoy a lot playing PSX on these consoles. What i would love right now is for a hidden hacker to release a new and improved method for CFW on the Wii U, or maybe Mocha/Haxchi to evolve further someday, who knows.