It looks like the baseball void in the Portland, OR area will be filled for either the 2012 or 2013 season when the Yakima Bears move to Vancouver, WA. A stadium is being planned for Clark County to open as early as June 2012, but given the aggressive schedule to make that happen, the move may have to wait until the 2013 season.
I thought that there was a very high likelihood that a scenario like this would play out since the Portland area is the largest market without a professional baseball team. After the Portland Beavers left at the end of the 2010 season for Tucson, AZ, there were no plans to bring baseball back to the area, but you had to know it was only a matter of time before an announcement like this would be made.
I also think that there is a good chance that in about ten years, the Pacific Coast League will bring AAA baseball back to Portland. This could play out like the events in the 1990′s when the Beavers left after the 1993 season for Salt Lake City, UT and the Northwest League team in Bend, OR moved to Portland in 1995. Then in 2001, the Pacific Coast League team in Albuquerque moved to Portland and the Northwest League team moved to the Tri-City area of Washington.
Take a look at some of my historical tables to see how the game of musical chairs has played out in the past.