many have been saved only by hearing reading "JESUS IS COMING SOON". AMEN
It probably works both ways. It likely causes disillusionment when people say “Christ is coming soon” and then Christ doesn’t come within their lifetime.
I think the sign I posted a picture of in the OP likely does more harm than good if the end result is apostasy. They would have believed in vain and thus lost their salvation.
Maybe with signs like this there should be someone preaching to explain what they mean exactly, to answer questions, or the sign should be reworded to make it clear it’s a possibility and not a forgone conclusion.