Regardless of whether Ryan wins or loses the Republicans will keep control of the House. I am seriously worried, however, that the Democrats will take over the Senate.
Under the 20th Amendment, the new Senate takes office on January 3 but the new President does not take office until January 20.
That means if the Democrats retake the Senate, Majority Leader Schumer will have over two weeks to push through confirmation of all Obama nominees from the Supreme Court to the district courts and there will be nothing the Republican minority can do to stop it.
That is a very real concern. Even if it is 50-50 in the Senate, Biden would be the tiebreaker.