Because it is extremely fun to start over, it breathes life back into the game, a chance for everyone to start on equal footing, for new players to get a real AO experience, for returning players to push themselves and there orgs.
Right now even with an active population enough to push content on the old server, it is still not happening, Omni for first time in a long time started winning at towers, and what did clan do ? they gave up and left, the drive of players is gone, AO is more of a chat channel now, and a toxic one at that, because everyone is bored, they have done everything and have everything, on a new server that is not the case, there is a reason to do absolutely everything.
RK19 did not fail due to a lack of players, but the incentive to play it, launch was a huge success there were so many people playing again, but the approach was off and doomed, content was restricted which meant everyone’s plans where also, AO is to big to restrict and nostalgia wears off extremely fast. And the biggest problem that killed the server, everything you did, achieved and paid for is 100% going to get deleted, you cant ask players on any game to invest all that for nothing at the end of it.
Anarchy Online is a absolutely amazing game, and RK19 was proof it still has potential, maybe not for the masses, but it still has potential for all the people who played it back in the day, and now is a perfect time to make the new RK20, because well the whole world is on lockdown and we need things to do :).