Three things.
First off when you walk up to a ticket booth there are no signs for 1 park tickets. Secondly if you as for tickets for 2 adult 1 day tickets they will sell you 2 1 day 2 park tickets. It's been this way for a few years now. The 1 day 1 park ticket is only sold at the gate if the guest demands it. So they could make HE two park ticket holders only if they wanted to, and if a guest asks for 1 park they are informed. Also the website defaults to two parks, so again it could prompt that you will not be able to ride the HE if you continue with the one park purchase if someone selects it.
As far as at the ride, they could charge the standard difference between 1 park and 2 park tickets for your number of days, eliminating the care about where the ticket was purchased. A 3 day ticket, that'll be $17.
Lastly, nothing has been announced. We don't know if they are going to convert to a resort ticket, allow one way rides, ect. So it's a bit early to declare it "an absolute ****show"