[Natsuki Hyuga]

Well, speaking about seiyuu's popularity would be pretty hard. Wakamoto is more of 'veteran' than 'popular', in considering that anyway... Not that I prefer Wakamoto's works than some other seiyuus.

Kamiya has the luck in being better publically promoted than normal male seiyuus usually with his partner OnoD, hah! since his pretty much great and noticeable voice works for many different series. Portraying lots of characters in spot do have effect in that (You won't say you like Lelouch as much as now were he was voiced by Miyata Kouki or Kappei Yamaguchi, won't you?), seeing his fans come from diverse voice works of him (mostly Tieria and Natsume)

Or in analogy, just think about veteran enka singer and pop idol singer as Norio and Kamiyan respectively.

And I'm pretty sure 1995-2005 period seiyuus also have popularity on their own, but whatever.