I don't disagree with your basic premise, but like others here, I do not see an easy path to that type of certification.
Just starting with *basic* things for handicapped people - like disabled parking - you still have 50 different States that have 50 different forms & 50 different procedures to get the plate/placard/hangtag for your vehicle. Not to mention multiple different costs, and methods of payment across those 50 states as well.
If we follow the logic that you have set forth, then we should also have a single, national form, and set of requirements, and payment/payment process for a handicapped plate/placard/hangtag for vehicles. Sounds great on paper, right?
Problem is, in the US that's not how our governing systems are set up. We *do* have the ADA, which is set forth by our federal (national level) government, right? That's law that codifies how disabled people will be treated, and what accommodations and modifications they can expect in "public" places. But it's up to every state, county, and city to make sure that those criteria in the ADA are met via building and business permits and plans, as well as code enforcement officers.
No one from the federal government goes around to every store, every restaurant, every hotel, every library, every school, etc. to inspect and make sure that those buildings and venues are handicapped accessible, and have appropriate parking as well as modifications to the building to allow handicapped users equal access. That falls squarely on the shoulders of local officials. Those folks are the ones who have to make sure that the ramps are sloped correctly, the bathroom stalls wide enough, and the auto door buttons are at the right height.
As
@lanejudy said, it has taken us a *long* time just to get to RealID. The big push for *that* started after 9/11, and we are just now close to having all states on board. And even so, how the states rolled it out to their citizens, and when, was no where near consistent across the nation; Oklahoma, where I live, is still struggling to get it implemented state-wide as I write this.
Please don't misunderstand - I want to see national standards for service animals as much as you do. But realistically speaking, that may not happen for a long time. Even the airlines, which are all tied together under the ACAA umbrella don't necessarily have exactly the same rules for animals that travel, although United & Jet Blue today announced that they were proposing the creation of a unified solution.
If - and it's a big if - you could get the ADA amended to be more detailed and direct about the requirements and expectations of service animals (including what *species* of animal is "acceptable") that would be a huge step forward. That would give all 50 states the framework they need to start enforcing those rules.