I don't think people have an issue with the protections afforded by the law, it's the lack of enforcement provisions leading to rampant abuse that is causing concern. No one has a right to entertainment, but if you decide to open a business providing entertainment to the public, there are laws ensuring that you can't exclude people on the basis of, say, race or physical disability. Sexual orientation is still being decided due to asserted conflicts with religious freedom. So if you open a jazz club, the ADA provides that you have to make reasonable accommodations for the disabled, such as wheelchair ramps or allowing a sight-impaired person to bring in a service animal. The ADA provides that the animal must be trained (which at a minimum means house-broken) but has little in the way of ensuring enforcement of that provision. If everyone acts as they should, only people needing service animals would bring them into businesses, and the animals would be trained. That's the way it worked for many years - you never saw an animal on public transportation or in a grocery store unless it was a "seeing-eye" dog.
Two things have changed, in my opinion. Medical science has advanced to the point where service animals are able to assist in new and expanded ways - such as animals trained to detect diabetic episodes or epileptic seizures (and I'm sure there are more). This means more service animals on the whole. Second - and this is the problem - there has been a proliferation of self-entitled goofs who take their pets everywhere and claim they are service animals. The ADA was trying to protect the privacy of disabled people by not subjecting them to having to hand over their "papers" stating the nature of their disability to random business owners every time they wanted to go somewhere. It was supposed to give them some semblance of normalcy to lead their lives the way everyone else does. But of course this now will be changed in order to prevent attacks and misbehavior by people's untrained pets. It really is sad.
