I was there at the end of February. It was very discouraging not only trying to get information from the CMs about the new policy, but also listening to them explain it to people. I was at guest services a total of 3 times (once to ask about the new policy, and twice for stickers for kids) and each time there was someone there asking about the pass. Now first of all this tells me that the pass was used way too much by people who probably didn't need it. But every time someone asked they were given a different answer by a CM. It ranged from having to have a visible disability, the person would have to come in so they could be physically seen by the CM, nope don't have them rent a wheelchair to don't have them, nothing we can do sorry.
My mother, being a typical senior, will not go into a wheelchair unless she can't walk at all. There's no way she'll rent a wheelchair, she'll just spend less time at the park and thereby cost Disney revenues that they would have earned. She's one of those people that a) loves Disney and b) wouldn't dream of not playing by the rules. When we were there in 2003 we got a SAP pass for her because even standing 20 minutes can leave her in terrible pain. It was an absolute wonder for her, and she was able to spend much more time in the park than on previous visits.
As for kids hopefully not wanting to spend the $$ for an ECV, I dunno. There were 5 or 6 kids in the group with the wheelchair, so when you have that many it cuts the cost down dramatically.
Don't get me wrong, I'm glad that they're changing the rules because it was (and still is) far too easy to abuse. I just think that they need to find a way to accommodate people who's disabilities aren't visible without having them resort to a wheelchair.