WordPress is Free Software. Its rules will never change. In the event that the WordPress community disbands and development stops, a new community can form around the orphaned code. Its happened once already. In the extremely unlikely event that every single contributor (including every contributor to the original b2) agrees to relicense the code under a more restrictive license, I can still fork the current GPL-licensed code and start a new community around it. There is always a path forward. There are no dead ends.
Movable Type is a dead end. In the long run, the utility of all non-Free software approaches zero. All non-Free software is a dead end.
Via Miguel de Icaza