I thought I remember a thread whereby a knowledgeable member discussed this as a possible problematic issue going forward. I found it interesting. (Was it Dr Chris?)
Before too many feathers get ruffled, I am not against a breed standard. This thread started out as a non standard breeders guide for beginners. I hope Trish isn't offended. She laid down a real nice foundation for this discussion, perhaps unknowingly. Many of us grabbed the ball and started running with it. It certainly produced a lively debate, was personally enlightening to me, and perhaps healthy to understand that a lot of us already have these non standard breedings and are overjoyed to have them. It doesn't diminish in the least the current standard, but emphasizes the potential yet ahead.
I don't see it as a problem because it hasn't really changed anything. We are actually as able as before to outcross as we were when we were in Advanced New Breed (this time last year). All that has changed is that we have to go one more generation of SV to SV breeding to SHOW the cat.
I can see how in other new breeds, for example the Chausie, it might be an issue. The Chausie has far far fewer breeders and hence it's genepool is more limited. Additionally, I think there are less pet owners of African Jungle Cats than African Servals, so even the gene pool of the exotic cat is likely more limited. The Savannah has been exponential in its growth, and there are far more catteries than any of us even know about. Indeed, it can be surprising to discover a breeder that has produced F1s for some years before they actually get online and we "discover" them, LOL!
For smaller breeds, limiting outcrosses for show purposes can be resisted. The Serengeti breed for example, just successfully petitioned TICA to allow them to show A-registered Serengetis while in Advanced New Breed (so the completely outcrossed to Bengal or Oriental Shorthair progeny as opposed to the two generations of breed to breed generations we were required to have) because of this issue.