Now, the reforms moving through Congress won't produce a system as comprehensive as what the Netherlands or Switzerland has. But that's not because of the individual mandate, which actually makes a lot of sense. (Read here if you want chapter and verse on that.) That's because the subsidies and regulation in these bills aren't as generous and strong as they could be.
In other words, you're forcing people to buy shitty insurance that they can't afford. Why would anyone possibly object to that?