Research the market where you live or intend to live. My observation is that BI can be vendor/geographically centric. I live in upstate NY, near the capital and Cognos & Business Objects are the overwhelming preference of employers to the MS BI Stack. However, downstate and in NJ, there is a significant demand for MS BI. Also BI is typically being used by larger companies, so if you live in a rural area without a lot of access to medium and large companies you may have trouble finding employment within BI specifically. I would also explore opportunites with your current employer. You may be able to use new BI skills without leaving your current job.