There's a very large chance they'll destroy all the other boards on 4chan. Every time /b/ goes down, either deliberately or due to a technical issue, its denizens flood out to the remaining boards and turn them into cesspits until it returns.
Ditto with the GameFAQs LUE exodus many years ago. I'm very well familiar with how things happen.
Part of the solution is suffocating the community by ensuring no one new can access the site. Killing a site as big as LUE was (or as big as /b/ is today) isn't going to happen overnight. It has to happen slower with a deliberate plan.
