Changing to a parliamentary system would require a huge constitutional amendment. Remember that the innocuous Equal Rights Amendment has still not passed: the chance of a sweeping reform on that scale is probably very similar to the chance of having a successful revolt.

So, in short, if you really want a parliamentary democracy, you'll need to move to one.

I have no illusions that the US system will change any time soon. But I think it's important to throw out ideas from time to time.