I have hard time seeing how emulation could become difficult or rare, they can't get rid of what is already there. On the contrary, I feel it will continue to become more easy and widespread. It also kinda is illegal already, atleast the way most are using it.
I tried openttd again after 15 or so years and it felt very simple to me. The passengers were just cargo with no predetermined destinations and could be unloaded to any station that accepted passengers. Am I missing something?
It's splitscreen, so there's no down time. Both players can do everything simultaneously, they are not bound to the same environment. I surely recommend it. It will most likely be the only way I play it.
In Original Sin games there was a hybrid of split and shared screen, so you could change it on the fly. I hope they add it in this game too.