I carry a 75D PCR most of the year, then switch to a Polish P-83, or Beretta 85FS for summer carry. I'd like to see a single stack RAMI or P-10 for easier concealment.
I don't think a single stack version is necessary for the PCR because with the VZ or AL grips, the grips become pretty thin IMO. The PCR itself is pretty thin, it's just that the controls (slide release, decocker, etc) are a bit thick. If they can make a low profile of those, I think the PCR is even more concealable.
Another thing with the single stack design is well, it will be a new design, so it will take time for them to work out all the bugs. Rather just make the grip shorter with low profile controls. I think it's going to be a lot more concealable.
I understand CZ is having their hands full at the moment. Imagine the CEO of Kimber or SIG (Cohen) at CZ, we'll probably see like hundreds of new models within a couple of years