I find this question rather funny. Look at it from the manufacturer's point. The guys who bash the AR, call a semi-auto pistol a "bottom feeder", and only shoot rimmed cases now want to join the semi auto world? Really? It spits in the face of everything the dedicated rimmed shooter has stood for since rimless auto cases have been popularized. I simply don't see the demand in a semi auto platform. Maybe a bolt or lever gun, but not a semi-auto, the same feed system which has been mocked, hated, and trashed for countless decades by this same group of people.
If I were to guess, and it is only a guess, I'd say the manufacturers see the market as well too small. If a given mass of people were to desire a semi-auto carbine in a pistol round, it would feel like that mass would be those using that pistol round in a semi-auto pistol. Ignoring the headaches that come with a rimmed case, the guys who only shoot rimmed case guns tend to not be interested in auto loaders, or they would have moved to rimless cases long ago.
If you have a group that enjoys both revolvers/lever guns as well as semi-auto pistols/rifles, I'm guessing you've lost the issue where a pistol caliber carbine "HAS" to be chambered in a rimmed case. This group would seem to be more likely to shoot a cut down .223 case in something near .357 bullet diameter rather than fight the headaches often found with a rimmed case.
The last group would be the semi-auto only shooters, who don't shoot a rimmed case now, and have no desire to do so in a pistol caliber carbine.
That means your market for such a rifle, would be the guys who only shoot rimmed cases and want a semi-auto, even though they despise the idea of every other semi-auto. Good luck selling such a beast. My gut feeling is that the guys who only enjoy rimmed cases would find a high quality lever action rifle/carbine to be a better compromise than a semi-auto. It will feed fine, allow loads from powder puff to full house, and as has been shown it will be plenty fast for most any hunting or range situation. The die hard rimmed a case guys have been going over those benefits for year, and now in this thread those guys want to abandon them for a semi-auto. Seems odd.