That could happen, but if you were running, say, a grocery store, and 90 of your 100 employees walked out the door in a single swoop, everything would look pret

That could happen, but if you were running, say, a grocery store, and 90 of your 100 employees walked out the door in a single swoop, everything would look pretty good for a little while, maybe even a day or two. There's still merchandise on the shelves, customers are still able to check out because you've routed your staff there. But over time things will start to cascade. The freezer breaks. Someone breaks a bottle of wine in aisle 10. A customer can't find anything and walks out. Etc etc. But yeah, for that little bit at the start, everything "looks" fine. Point being: it's way too soon to say twitter is surviving.