Gun Plummer, what's wrong with that? Historically nearly every lever gun wad a pistol caliber selection, such as 32-20, 45 colt 44, even a few rounds akin to the 9 and .45. They aren't necessary, but a 30 would be a nice shooter. People used to buy up surplus rifles
Jim Carmichael was one of the great hunting/shooting experts. The carbine was one of his favorites. I'm pretty sure that he'd hate either of the others.
It almost sounds like some of you are saying "good riddance to bad rubbish" and I don't get that. It's been replaced by other, more useful rounds, but that doesn't mean a lot. I shoot my .357 lever all of the time, but I never thought about a 30 carbine, or as it would node normally be, a 25-20 or 32-20
If you're someone who is prone to pipe dreams and wishful thinking, this is a great idea. Personally, I've still not given up on Browning creating a drilling rifle with a rimmed nitro express main and a powerful thirty secondary.