I've been in this dillemna for the past 2 years.0; I decided to get a second BA in hospitality because newspapers are closing left and right, so my degree in Journalism is losing value fast. ; Maybe somewhere down the line I can actually pursue a job in journalism.
In your case, I'd recommend maintaining your job and enrolling in evening/night classes.160; Right now, it's difficult to find a job and having one is a blessing.  This summer I've met people with years of experience in multiple industries that can't find any jobs. ; Businesses are closing left and right, and I would hope that there is a bit more job security where you are.
It may be different in a few years and maybe the economy will be back on track, but for the time being embrace your job. Once you're ready to consider an MBA, then you should consider your options.
I hope that this helps :)