Pakistan is Pakistan and anything is possible. We have seen both PPP and the Noonies kicked out of power, leaders imprisoned, exiled and even killed--and multiple times. The Establishment of Pakistan was always behind those developments. So while we can't rule out a political revival of Imran's PTI, I put chances of that as near 0%: One can't call all other politicians thieves and corrupt, make enemies in the Establishment and rely on a voter base of just 30% to come back to power. Politicians the world over show flexibility and accommodate each other while holding their nose. Imran was too stupid and too arrogant to realize that.
And Imran's supporters would be deluded to think the imposition of the Governors Rule in KPK is not the final nail in Imran's political career. He made too too many mistakes and the Pakistani political system is too vicious, too vindictive to accommodate such mistakes. The only chance--the only remote chance for Imran would be a catastrophic military defeat of Pakistani Army and/or economic implosion of Pakistani.