Technically, they already have, since the Freespace 2 code was open-sourced.[1] And there have been multiple space-flight Kickstarter projects, such as Star Cit

Technically, they already have, since the Freespace 2 code was open-sourced.[1] And there have been multiple space-flight Kickstarter projects, such as Star Citizen, Elite: Dangerous, and Limit Theory. [1] http://scp.indiegames.us/ http://scp.indiegames.us/