Seriously, I doubt it would even take that long. We get used to shit so quickly, and the news cycles have to keep feeding us new things, the only way we’d keep talking about the aliens if they kept doing new and interesting things. I’d be willing to bet a year later there would be some people who straight up forgot about it. “Oh yeah, aliens! Are they gonna, like, visit at some point or just keep exchanging calls with the Whitehouse?”
When the Pope said it was likely they existed EVERYONE knew that meant they are likely out there. I know that religion is not the best cross section of rational science going folks, but that’s the point. When even the angry sky daddy is saying they are somewhere, we are definitely not alone.
Now do we know what they are or if we can even communicate? Fuck if I know.
I know what you mean. The church is usually the last to recognize new realities so if they are open to it that definitely says a lot about where the Overton Window is.