In the US, is this actually the moment past the point of no return?

We don't know.

The US came back from a US president hiring private goons to spy on his political opponents.

The US came back from a US president illegally selling weapons to Iran to fund right wing militias in South America.

The US came back from a US cabinet member taking literal bribes from oil companies to give them oil drilling rights on federal land.

The US came back from a US president illegally firing a cabinet member and installing his own lackey.

But it didn't HAVE to.

I don't think there's really such a thing as a 'point of no return' for a Democracy. But it is possible to get to a point after which you don't return.