Konica had a C41 3200ISO film. I only used it a couple of times, both times in medium format. Sure, it had grain but in 120 it wasn't obtrusive and it allowed me to do things I couldn't otherwise do. I was a guest at a celebrity wedding, and had free hand to take whatever photos I liked provided I did not use a flash. Same rules for all guests but I was the only one who actually got any decent photos....by shooting on film. This was in 2005, I'd frozen the Konica 3200 since about 1997.
Fuji Super-G 1600 and later Superia 1600 were pretty good in 35mm, I used to shoot gigs on that. The Fuji Superia/Press 800 was so good at regular photo sizes that you could use it as an every day film. Only when you started enlarging over 10" was any grain at all noticed. And even then it was "nice" grain. Superia was a big improvement over Super-G in terms of grain. I would agree that skin tones weren't great with either, but I was using it to shoot gigs under spotlights and with spectacular coloured lighting effects, or places like Las Vegas at night....so that wasn't an issue.
No doubt a 3200ISO C41 film is possible. But the market must be very small. Only one manufacturer ever made it and I think even they axed it circa 2000 when film was still king.
There might be a market for a faster Ektachrome, say 400. I still mourn the loss of Fuji 800 and pick up the Lomography branded 800 film when I can. Which is widely believed to be Kodak Max 800.
Kodak used to do Royal Gold 1000 which was a bit too red for my liking, but probably handled skin tones well in natural but dull light like cloudy days.