Hey yeah I remember this.
Not that I have any particular interested in silly click and grow games but if you don't increase industry people just move out... I went ahead and created about 30 factories by running
http://blockland.myminicity.com/ind through a couple of html validators and proxies to help out, mostly because I was curious if it would work. It did.
EDIT: Unemployment is at 0% so you can start moving people in again. Once you get to 30ish% people start moving out.