No, at some point the girls will become too old, break down, or otherwise realize that this isn't what they want to do forever. They'll want to settle down, and probably have kids with a man
They will look back at their streaming with regret, cringing at how they literally pretended to be an anime girl for a bunch of lonely losers.
They will "graduate", which is faggot weebspeak for saying they will quit their JOB (amelia literally referred to her streaming as WORK), and then do something else with your money.
So no, it will not be forever, you are a delusional faggot and should probably visit a mental health specialist.