I am thinking the Republicans are in much the same place they were prior to Trump's election. Internal polling and sentiment showed then that they were in trouble, and yet Trump won the election.
Internal polling and leadership sentiment show the Republicans are in trouble now. Lots of indicators that they will lose the House and possibly the Senate. And pre-Kavanaugh that is exactly what I was expecting to happen.
But the whole Kavanaugh debacle has energized a lot of Republicans, and I believe quite a few more will turn out to vote than would have otherwise. However, the recent fun and games has also energized the Democrats, possibly moreso than the Republicans. At this point I don't think anyone can accurately predict what will happen and we will just have to wait and see.
My gut tells me the Republicans will lose seats in the House, but barely retain control, and that the Senate is up for grabs.