Employers have been using part time workers and temps for years to avoid paying health insurance- didn't you know that? This is nothing new.
Your employer does NOT want to provide you with health insurance. I promise you that.
That's why Obamacare is so important. It's for workers whose employers screw them by cutting back their hours and it provides financial help to those people to obtain health insurance.
It's not going to create a workforce of workers who work less than 40 hours per week. We already have that. Go work at Walmart if you don't believe it.