I readily recall in the 80's era getting excited over watching MLB pitchers throwing in the 90's. It was a rare enough to take a moment to watch in amazement. What has changed? How do we now have 1000's of pitchers in the 90's? I have no doubt that 95 will soon be the new ave MLB FB.
So the HS 90's guy will be like today's HS 85 guy. Not much interest in a RHP topping out at 85, no matter what kind of spin rate you have. In the next decade, I can foresee a world where 90 won't get you much interest.