House with missing Leader

Hi, I'm on a newer server (typically level 10-20 heroes) and our house's leader has been missing for 4 days. My house is otherwise happy and likes our city, but having an MIA leader is problematic.

Assuming he's not coming back, I wanted to double-check our options. I'm fairly new to the game and want to ensure I understand the city/house mechanics correctly.

I'm figuring we'd need to have a coordinated plan to all leave our house and city, create a new house (or join an existing one), then come back and defeat our former-leader's base to reclaim our city. We would also need to try to do this vacate-and-recapture fast enough for our many enemies not to catch on and make their own play on the vacated city.

Is that how the plan would need to go?