If IK is disqualified I think PTI will continue the current setup if they can.
They will boycott National Assembly general elections while contest in provincial elections thus making any federal govt weak if they manage to form Govt in KP and Punjab back again and that too without Imran Khan. This should be IK plan moving forward. Thanks to 18th amendment, any federal govt without Punjab in power will be pretty toothless. PTI will than raise hostility between provincial govts and federal. No one like to be a PM under that situation. Though if PM comes from PPP than with Sindh govt, PPP will have some respite but this setup will not be acceptable to PMLN at all. For now, they are just waiting for IK to get disqualified that is why hanging in the center but if PTI adopts the strategy which I just explained earlier than there will be a setup which will not favor any one.