The protests following imran Khan shooting incident were too small. Seems like peoples are too afraid to come out. Even a regional political party in India could bring hundreds of thousands peoples to street for much smaller issues.
At this point, Imran Khan is checkmated. If he say something against army, they will charge him with terrorism and disqualify. If he didn't, ISI will go after low level PTI workers one by one and weaken the party. Low level leaders won't be able to resist the pressure and they may even defect to other parties.
Imran Khan had only himself to blame for this situation. Few years ago, when ISI was going after PMLN low level leaders, PTI was cheering for ISI and boasting about how PMLN leaders got "Attitude adjustment". Now PTI low level leaders are gonna get the same "attitude adjustment".