Listen - If I’m severely allergic to chicken, i’m not going to Chik Fil A.
Chick-Fil-A is all about chicken, though. Dogs aren't central to Disney, (apologies to Pluto

LOL ) including their resorts or restaurants. They may not be in the parks as a result of this new policy, but it could be a different story if you want to visit the Boardwalk and take a walk around the lake, or visit YC/BC/BW for something to eat or drink, let alone want to stay at those resorts.
I get this is good news for some dog-owners (although it may not be much fun for the dogs themselves) (at least, not without ignoring some of Disney's rules), but you can enjoy a Disney trip without your pet, whereas some people can't enjoy a Disney trip with dogs there. ...And since dogs aren't crucial to Disney this is unnecessarily creating problems.
I personally think this is a pretty cool thing and will work out to be less of a big deal than many are thinking...I live in a very dog friendly resort area and it doesn't appear to hamper tourism or cause crazy incidents with rampaging dogs terrorizing the streets...
What you can't see is the affect it is, undoubtedly, having for people who want/need/have to avoid dogs, though.
I can see that a better balance of dog-friendly places was needed in places, but it seems to be swinging too far the other way and the ones who are affected don't have much of a voice.
Where I live there is now nowhere to enjoy a walk freely where you won't encounter dogs running off-lead.
Some places just don't need to allow dogs.