I doubt Dee Roscioli is coming back to the Gershwin. The only reason she is doing the tour is because it's for a short stint on a few stops (ala Shoshana Bean) and rumor has it that Mamie Parris will take over for her. If she does return I'll be a bit upset. Don't get me wrong, Dee has won me over, she is simply amazing but come on...bring someone new.
On topic of Kate Shindle blowing out her voice in Wonderland...she said in an interview that after they were told that they only had like a week or two before they closed...she pretty much stopped reserving her voice so much (as she would do if expecting a long run) and started going full out every night...which led to her being a bit tired towards the end. I have no doubt that she would be able to perform Elphaba. She would most likely take 2 performances off a week cuz she seems smart and knows when too much is too much, but the 6 main one's she would kill! And on Seth's recent OBSESSED video she belted an A several times in a row...which I know is quite different then doing it 8 times a week but she did it during Legally Blonde. But again...that was for like 5 seconds for one song.
"Life in theater is give and take...but you need to be ready to give more then you take..."