Reddit will be fine in the short term sure, but anyone who actually gave enough of a shit to put in the effort needed for it to work well have left or stated that they will no longer do anything more than the bare minimum. Reddit will still be around for a while, but it will never be the same place it was, and eventually will just become irrelevant as it's overrun with trolls and scammers. I give it 3 - 5 more years before it disappears without fanfare and no one will care.