Most of that I agree with 100%. GT3 will ensure growth and the largest participation, which is very important.
Only thing I might disagree with is a fast repair. Considering we're aiming to be more of an entry-level league, rather than a pro-type league, we want it to be beginner friendly. It is always nice having a fallback on that.
Other than that, I'd love to see it happen. I highly doubt we'll get anywhere with the Caddy. Personally I'd love to see a GT1/GT3 combo... that would be absolutely amazing, especially with the upcoming Aston. Would have to drop a GT3 car to make it work because we're limited to 5 cars currently.
In theory that would be awesome but we'd have to get good participation from both series for one, and two, enforce racing one or the other (no switching back and forth, etc)