I'm still going to keep building dots, because what else am I going to do with my flex? I tried the other games, and while MB held my interest the longest, neither one of them holds long-term appeal to me.
But I completely understand people not wanting to build because the site might shut down tomorrow, or next week, or next month. It's maddening that the game's creators and operators won't commit to a build cycle to spark participation, because this is negatively impacting my experience as a user and player.
More people building = more competition, more vibrancy, more voices, more fun. It also means more flex and more dollars.