But this change of a city to a colony/outpost via button should be reversable to change it back to normal city, but than full cost will hit again. Flagging a city to colony/outpost should limit to 2/3 pops or kill all pops over 2/3 pops also if you change a full city back to colony/outpost. So the gamer will think twise to make a colony/outpost to city or reduce it back to colony/outpost if in financial trouble. Also the gamer will think twise about to upgrade the colony/outpost to a full city. Also can be limited by letz say you need 3 full citys before you are able to build colony/outposts via settlers if needed.