Frankly, I like the style of some of the broadcasters from other teams more than I do Niehaus. His over-the-top delivery kind of grates on me. But he was the first of an era to do that, and it seems like most teams are hiring broadcasters like him now.
My bet is on Randy Johnson to be the first player with significant Mariner experience to go into the Hall of Fame. Gaylord Perry just doesn't really count as a Mariner.