I was thinking about this idea for some time but was not sure if i should suggest it. Anyway.
Right now there is a chance we see another Dreamcast game and that game would be by Yuan Works who created Wind and Water: Puzzle Battles and re-released it in 2016 by other publisher.
Afew years ago they were about to make another Dreamcast game called Little Ninja but development was stopped due i think some good reasons and they are back now with updated Wind and Water: Puzzle Battles release and intention to continue develop a game called Little Ninja. We must support them!
We here at dc-talk need to do everything to support them.
Announcments, mass emails anything
Alll available information is here http://dev.yuanworks.com/wind-and-water-dreamcast/ and here https://www.patreon.com/yuanworks