See, this is what gets me. If all your dog has achieved in its life is a) surviving to sexual maturity intact and b) being a "nice dog", why exactly do you think that you need to make more of him?
I'm not hung up on conformation titles. Heck, I'm not even hung up on titles from any kennel club - if you have a dog who's out there proving himself every weekend as a useful stockdog, SAR dog, or hunting dog, he's already achieved more than 98% of the dogs in the US ever will, and it's certainly worthwhile to consider breeding him. (You certainly don't have to, and it's still possible that you shouldn't, but having a dog that's done something beyond pooping and not biting the kids is a good start.)
I'll come out and be heretical and say that crossbreeding is not, in and of itself, necessarily evil. If you're breeding dogs for a specific purpose (stockdogs, SAR dogs, police dogs, hunting dogs), the paper doesn't matter. If there's genes over in another breed that could be useful to the purpose that a dog is being bred for, then why not use them? This is how breeds were developed for their "original purposes" way-back-when; as the work of dogs has changed over time, isn't it possible that careful crossbreeding would, instead of "dirtying" the breed, improve the dogs?
Of course, if you're just crossbreeding to make status-symbols for suburbanites (hello, Goldendoodle!), what's the point?
I do think that there's value in preserving certain breeds, even as their purposes change - look at Shelties. Very few people rely on sheepherding for their livelihoods in contemporary America, and sheep-farming in this time and place is vastly different from what it was in 19th-century Shetland. If you want a professional stockdog nowadays, you want a Border Collie-type dog, not a Sheltie. Sure, some people "do herding" with Shelties, and that's great, but how many are actually relying on the work of their herding Shelties for their livelihoods? Today's Sheltie has a very different job - usually as a beloved pet or, less often, as a hobby-competition dog. Is it really a terrible loss that Shelties are now bred more towards companionship than herding? I think not; herding (and the type of herding they were originally bred for) has been eclipsed by a vastly different type of work. We still breed for a healthy, sound dog that will be an active, long-lived family pet, and keeping the breed alive for that purpose is, I think, very worthwhile.