I would hope that Geno would get his own reveal trailer. I understand we may be a little bit more pressed for time going into this Smash, but those newcomer trailers are just so damn cool that it would be a shame to take the spotlight away from any individual character or rob them of a chance to have an awesome trailer. Even the high ranking candidate of Dixie Kong and King K. Rool to me seems like it wouldn't be entirely fair to the both of them despite how well it could work.
I do disagree with the statement that they are running out of characters to add for Smash though. Nintendo has such a rich history of characters from series already in Smash, series not in Smash, and one-off characters that, honestly, we could have 50 new fighters and still have a good number of characters to choose from. How recognizable all those characters may be is another story entirely though. The quality of Super Mario RPG and the fan community supporting both that game (Specifically on the VC for Wii) and for inclusion in Smash have done a great deal to keep him alive over the years honestly. Most characters similar to him wouldn't get such an extra breath of life to be honest, but at least Geno has survived in large part thanks to the community of gamers while other names have fallen off.
I continue to think that Smash Ultimate is Geno's chance to get in the game. If he doesn't make it here, I'm not convinced he ever will, but I'll hold out hope until there is no hope left to hold on to for Ultimate's speculation. I just really hope we get some news soon on new information for Smash Ultimate. The problem with Everyone is Here and the E3 blowout is that all of the information on the site has remained information we know. Even though what I more specifically hope for is a new character reveal.
Edit: I also noticed I'm not on the supporter list (Which seems quite small to be honest), when the next update happens could I be included as well?