There are people who're gonna' do it regardless, it's the unfortunate nature of the beast with this fanbase.
Speaking of crowd flow, I'm not entirely sure Disneyland itself is made for the kind of crowds this'll bring. I've got a good feeling it'll reach capacity in it's opening year, so it'll be interesting to see how the lines snake through the rest of the park.
I'll add if there is a aspect that can be considered better, I think the only answer here is FastPass. I feel it'll be actually possible to snag a FP in DL. DHS on the other hand, you gotta' deal with a system that's beta/broken to begin with, and it ain't gonna' be fixed by the time this opens.