A lot of the hype does have to do with nostalgia. Even though I knew of some old anime, I didn't really know what anime was or that it came from Japan till I saw it on Toonami. The first show I saw on it was DBZ followed by Gundam, so on and so forth. That got me to research more about the shows and find out a lot of the history and backstory. For many of us 90s kids, and even slightly older folks, it was a way for us to get kick ass anime on TV and it introduced this genre to the mainstream audience. Without Toonami, I'm pretty sure shows like DBZ would still be rather niche. Lots of people would still know about it, but now, everyone knows of shows like this. Toonami was a big part of the anime boom in the US.
I also think that part of the reason for the hype is the potential for new things to be introduced. I mean, I never wouldve seen shows like Outlaw Star, G Gundam, or Zoids if it wasnt for Toonami. So there is a potential to bring in new media to the forefront. And for us, the potential to have Tokusatsu thrown in the mix makes some of us really excited. I mean, imagine if they decided to bring a Kamen Rider, Super Sentai, or Ultraman series to the states, subbed or dubbed. Either way, that would lead to more eyes on this genre, which means the potential for DVD sales here in the states.
So, the whole #bringbacktoonami campaign is a beacon of light for us fans of this small niche genre. It could lead to some great entertainment, or at the very least, some awesome nostalgia.