Was there even a mass exodus? I largely avoid Reddit now, but I do kind of doubt that they've been hurt in any meaningful way by all the protests and people leaving...
I feel all those posts about reddit looking for mods for various communities is a good indicator. They might not have lost quantity all that much, but a very small portion of quality kept a lot of reddit interesting and running smoothly. A lot of that has either just dropped entirely engaging or migrated.
I doubt everyone would move. Some people simply take it as a sign to move on and do other things with their limited time on this little planet.