If they employ the core team, and own the immaterial rigths, they could 1. Make next version propietary, or particially propietary 2. Keep updating the closed

If they employ the core team, and own the immaterial rigths, they could 1. Make next version propietary, or particially propietary 2. Keep updating the closed version, no more core team for open version 3. After some time the open version is too oudated, too far behind the propietary version 4. Ambiquity on lisencing also deteriorates intrest For examples see, Qt, MySql, Java