Changing the titles costs money.
Not a lot.
but there's a budget.
Paying the actors now, and paying the actors in the future, are not only in the hands of completely different budgets from the graphics budget of the immediate production costs but most probably different departments and even companies that might not yet exist.
"Right now people" don't give a shit about "future people" and "future people" hate the shit out of thoughtless "past people" so fucking presumptuous that they believe that are "right now people" that they fuck every thing up for the "future people" who really are the "Right now people" ad infinitum.
How come talking about the 4 dimensional economics of Hollywood sounds like a science fictional temporal cold war?