The problem is that snakes are not herd animals nor pack animals. That desire to belong to a group is what makes it easier to domesticate horses and dogs and such. Reptiles have no desire to please even other reptiles generally, so it's much harder. It's much easier to modify an existing behavior than to create a whole new one.
I do think that IF keepers began choosing only the most calm of snakes to breed, you might get a line of snake that hatches out to be more mellow and accepting. But it wouldn't "appreciate" the owner, nor be a 'partner' to a human like a horse or dog.
Domestication is only the tinyest of steps in something as long term as evolution. Controlled breeding can change certain aspects but the base animal is still the same. Dogs are still pack canids. Horses are still herd beasts.
So.... in a way, you could influance the temperment possibly to a small degree. But changing the entire nature of the animal wouldn't be possible in just the domestication process.
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