I worked for several years on Caliross and I am already a few years behind schedule for a 1.0 release at this point. While this means I got the chance to add way more than I previously planned, it also meant that some of the original ideas I had never made it in the game. While I like the game, I'd probably burn-out on the project if I kept at it for another year or two.
Also, you'd be surprised, but long projects tend to lose support over time, so the more I work on Caliross, the more I stand to lower how much I make. Perhaps a new update a few years down the line could be different, but I wouldn't count on it. I have the next game lined up anyway, and that's a sequel to a previous game which can't really wait much longer either.