"not doing X means innocent people will die!" Here, X is passing the health care bill. But X could just as easily be lowering the speed limit to 20 mph always and everywhere. The argument proves too much.
It's not too late to kill it if both bases coordinate. Markos and Glenn Beck can do joint appearances. Let's not pretend it will be improved substantially or that any "improved" bill would not be just as politically disastrous. Maybe try again in 10-15 years.