Nah, he finished the chopper game that Sim City grew out of.
"Wright continued to develop the editor for [Raid On Bungeling Bay] as a personal toy because he enjoyed it so much. He researched urban planning and realised that others might enjoy constructing and building cities themselves. The result was a more advanced simulation that eventually became SimCity."
- the Wikipedia page on RoBB, which also notes that it selling about a mullion units in Japan was a large part of what gave Wright the financial freedom to build Sim City
https://en.wikipedia.org/wiki/Raid_on_Bungeling_Bay