The biggest 2pac fans I've met are not members of any online rap/2pac forums. You guys assume that the top five 2pac boards on the internet constitute the biggest 2pac fanbase or something? It's bullshit.
The "tupac scene" people talk about is really the bootleg scene, the scene where grave diggers thrive and stroke their penis by obtaining rare 2pac material.
The Tupac fanbase can only expand. Tupac fans aren't dying because his target market wasn't the baby boomers. Tupac fans never stop being Tupac fans because he was so awesome. Little kids are eventually going to find out about Tupac even if their first favorite rapper is lil wayne, they'll stumble upon Tupac and be hooked on him.
The fans are still there, Tupac is still discussed in cars in drive thrus, in clubs, on basketball playgrounds, during recess in middle school.
We don't need fucking online forums for Tupac to be relevant.