It has served its purpose of ensuring that any charges that eventually come from Muller will be dismissed by Republican base and likely ensured that Republicans won't feel the need to impeach Trump for obstruction of justice no matter how much he deserves it.
Wasn't that already the case, though? These guys have been claiming there's a "deep state" conspiracy to "get" Trump since before he was even elected. They didn't need Devin Nunes for that.
-k