Not necessarily. I'm pretty sure burning Alex was still a roleplay spot. Alexandria would be a great place to grind If that were to happen.
Hilltop was attacked and burnt. I don't know where the survivors retreated to, but it was somewhere near a highway. Imagine starting a roleplay waking up from the burnt ashes of your once mighty community. Or waking in Alexandria as whisperers and walkers alike roam the streets in dozens.