I have two thoughts on this:
Germany is currently governed by a coalition between the major center-left and center-right party if you want to use the traditional terms. That's something different then one of two parties right or left from center.
The head of government in the German system also has a lot less power then a US president.
New parties are able to enter parliament and as long as they have >5% and gets seats nobody sees those votes as wasted.
Political polarization in the USA has been increasing for decades, and has become quite severe. This may have a variety of causes, but it seems highly probable that the internet has played a large role, by facilitating the toxoplasma of rage to an unprecedented degree.
Recently I have the (wishful) feeling that the parties have moved so far apart that there is "room in the center". The left is for people who are fed up with the extremes of the right. The right is for people who are fed up with the extremes of the left. But where do people go if they've become fed up with both extremes?
The question is: how would the new center work? There's not room for a new political party; plurality voting makes that too difficult, because if the new party doesn't gain more than 1/3rd of the vote, it's basically a wasted vote.
Here is my proposal for what it could look like:
It might also be good for the initial set of criteria, or at least the rhetoric, to appeal to moderate libertarians as well, since that's a pre-existing group which considers its issues to be orthogonal to the usual political spectrum. I would personally think the core values of the new center should resemble Scott Alexander's take on classical liberalism:
The classical-liberal rhetoric of the new center might be very similar to counterweight, except that counterweight only combats the extremes of one side (as expressed vividly by their name), rather than extremes on both sides.