I don't have a problem with this, however I think Disney will need to monitor closely to ensure people aren't just leaving their dogs in a hotel room for 12+ hours while off in the parks.
I LOVE my dog and would love to travel with him, but I have no plans to ever bring him to Disney World because that's not fair for him, nor is it fair to my pocketbook because I don't want to spend an extra $50-$75/day plus the cost of him being at Best Friends doggy day care each day because I'm not cruel.