Absolutely. I have one variety of one breed that I'm keeping, and that's it. No more.I sold the last of my turkeys, and once I'm back from vacation I'm going finish downsizing. Only bantams I'm keeping are Creles and Golden Sebrights (I hatched some that are 3/4 back to my Dad's line, and they're really nice).
I think if you seriously want to breed to standard, you need to limit what you're working with.