I think it's a bit early to assume Pixar is getting an E ticket, discussion here seems to indicate that Star Wars will be the "big" project and Pixar remains an unknown (though it sounds like it's a lesser part of it). I fully expect an E for Star Wars (unless a budget cut kills the quality per usual), but Pixar is uncertain. As it's going to be the first phase of the project, for all we know it could just be something like Toy Story Playland (something I don't consider unlikely in spite of my hopes to the contrary). TSP has been rumored for DHS in the recent past. So there may not be a Pixar E-ticket.
It all depends on what unique rides are planned for DHS and the quality involved. I'm fine with no Cars Land, but if they don't clone it then they HAVE to have at least one new ride up to par with or better than RSR's quality for the Pixar portion (a classic Disney quality E ticket). I don't at all disagree that parks should stay unique. But carnival rides don't cut it for unique, I don't want anything like Toy Story Playland at WDW, even if it's rethemed to be more "unique" (we've already got Dinorama is it is).
But if I had to guess, clones are probably happening in some form. It sounds like DL and WDW are both getting Star Wars expansions, one would think (given the trends) that they will have similar rides. The question is what kind of clones there are going to be. A clone of a good ride is better than a clone of a bad one. I'd even say a clone of a good ride is preferable to a poor quality original ride. And carnival garbage definitely doesn't cut it in any form.
The only thing that is certain to remain unique in the upcoming work is what they are legally prohibited from building at WDW- Marvel. Unless Guardians of the Galaxy is the Marvel project.