An MBA is a professional degree. It will help accelerate your business career and create many opportunities for career switches into highly-sought-after positions in consulting, investment banking, and venture capital.
In two years or less, you will become well-versed in such areas as finance, management, marketing, and strategy. You will also learn a whole new way to analyze business issues and be exposed to powerful techniques to help sell yourself to your full potential.
Since the economy is not showing signs of accelerating anytime soon, then these two years (assuming you attend a traditional two-year, full-time program) sharpening your job skills, improving your résumé, and expanding your network look even more attractive.
In addition to giving you additional career flexibility and helping you switch occupations, a degree from a top program will increase your earnings potential by over 150%. It's pretty tough to do that by staying put for 2 more years!