St. Louis Park provided dispatch for Golden Valley for a number of years, the when costs went up GV moved to Edina for a few years before moving to Hennepin Dispatch, when GV had decided to transition to Hennepin Richfield was looking at dispatch options and moved to Edina. I have heard speculation that SLP would move dispatch I am not aware of any plans for that to happen. Edina would seem the logical choice, similar city services and structure.
Big picture view I could see a good case made for a regional Combined 911 center replacing Bloomington, Eden Prairie, Edina & Richfield, St. Louis Park.