“If we go for the shutdown...”
“We” have nothing to do with any shutdown, only the President and Senate majority can cause a shutdown
Yes, technically speaking, if the Senate refuses to pass a CR or the POTUS refuses to sign one, either of those actions causes a government shutdown.
So the issue becomes whether or not we (the Tea Party, the grassroots, conservatives, etc.) are willing to endure the “pain” associated with a prolonged government shutdown in order to force the Democrats to defund Obamacare.
One way or another, we’ll choose.