^ No it hasnt. I saw and interview last year where Imran clearly said that if there are no investigations he will go for midterm polls. heck, in India, while replying to a journalist, he said that they way things are going, he sees PTI in power in 2014. And this was in November last year I think.
You and I gave the exact same analysis of Imran's jalsas, remember? I believe we were responding to Saq's question. We both said that this was start of Imran's election campaign for midterm polls.
As for unconstitutional means, I dont think it will come to that. If the govt goes, I believe Sharifs will resign and leave for their homeland. you know, the standard Sharif operating procedure