The Physical Camera lent a lot of code from VrayPhysCam. In fact, I remember seeing Vlado's comment that he's not 100% happy with Autodesk's implementation and decided to leave the original PhysCam in Vray's code, it's still accessible by mxs.
Getting Autodesk to fix the issues can easily take a year or two, as can be seen with various defects and requests. Even if they get around doing it soon you still don't know if things are going to be made easier for 3rd parties to build upon, or if new bugs are going to be introduced. There are some options that are ART-specific (bokeh controls, vignette) and don't match Corona's feature set. I'm all for a new camera, and maybe they can do some things better, like preview planes being bent accordingly to real world optics (for example, the focus plane is flat which is wrong, it *should* respect true distance from focal point and be spherical, applies to all camera the planes btw). Heck, we could even get a 'stored positions' rollout where we can conveniently store different positions for a camera etc. I'm all for a fresh new start.