My PD is June 2010. I am stuck as you and could not change job. My guess is early 2015 or worst case to get an EAD is as Kanmani mentioned (but a correction NOT 50% , i am at 90% confidence level) next year this time.
It is not worth a job change with this condition of PERM and I-140 delays and worries on PERM audit , attorney errs, RFE etc..
if possible hang in there, lets hope for the best.