Good point, and I fear the same thing. I don't know anyone in real life who likes KotCS as well as I do, and would be as excited as I am about a fifth movie.
I went to Comic Con in Brussels three days ago, there was this panel talking about the new Star Wars, the new Captain America, Batman v Superman, 10 Cloverfield Lane, etc. Then at open question time, part of me wanted to ask what they thought of the news of Indy 5. But another part didn't dare ask, for fear that they'd laugh me away.