Haven't seen them all yet...i wonder if ECCO or VECORMAN would appear..I guess not since they are Sega of America..
Unfortunately, I don't think we are going to see them in future episodes. Based on the cameos and current direction of the show it is definitely made for a Japanese audience. So they are probably only going to use references from popular titles release over there.
Although next week's episode features Space Channel 5 and that game didn't do very well at all. It barely broke 150,000 in total sales and some historic charts show it didn't even break 100,000.
Wasn't Seaman the top selling Dreamcast game (if you included software sales that came bundled with hardware)? Maybe that means they will feature Seaman in a future episode. No offense to Seaman fans, but I would be ok if he/it doesn't show up.