It is true,
Jason did spike in popularity, but it's peak was three and a half decades ago in the mid 1970s, and the popularity seems to be dropping by the year. Popularity isn't really an issue with me though, if I like a name I like it.
Jason appeals to me, I greatly enjoy the legends of characters who have borne this name, and also appreciate the meaning. I've often thought about it. I believe it's among my favorites.