That is true. I guess the best model would have been to keep everything standby only and cap attendance with the reservation system to keep the lines somewhat reasonable. Raise the prices to compensate for the lost attendance.I'm not sure why that's obviously better. In the current model, I can decide if I want to pay the $15 or not. Sometimes I might want to, other times I won't. If it ends up getting folded into admission no matter what, I don't get to choose.
What's more, we know what happens if everyone has access to it. It was called FP+, and it had plenty of problems---maybe the most significant of which was that it was too popular.
I have no intention to pay for Genie+ or ILL. If standby is intolerable then I'll just not renew my annual pass next year and get my theme park fill elsewhere.