Well at least in wasn't a Blue Wave.
The Senate deals with borders, treaties, immigration, Constitutional law. The House deals with entitlements, equity, practical justice.
The results seems ot affirm Trump's economic and cultural nationalism. The result was not about immigration, 'tone', 'racism', AGW, Kavanaugh (and Roe v. Wade, homosexual marriage).
Trump lost the House because of his Tax Bill which was rightly seen as a bill for the rich, as regressive and, as reinforcement of the polarization of wealth that is at core of the divided America (and the rest of the West). And he lost it because of his Health Care proposals which would not cover pre-existing conditions and was a sell out to the private Health Insurance industry.
American politics have two original impulses. That of rugged, individual self reliance, and, that of sustaining, protective community. The former is the banner platform the NeoCon Republicans and is closely aligned with nationalism; the latter the banner of the NeoLib Democrats and is closely aligned with populism. There doesn't seem to be a middle ground any more.
Trump's challenge will be to reestablish the link between nationalism and populism and to do that he'll have to cut his ties with the NeoCon Republican Establishment (with their mantra of privatization (especially Medicare and Social Security); deregulation (especially banks, trusts, markets); free trade; regressive taxation. They are true economic liberals (and corporate shills), and, have no affinity for real economic progressivism (defined as equitable distribution of wealth). Nor does the Democrat Establishment which is primarily about feminist, homosexual, eco utopian cults not about working families.
Trump's original sense of a nationalist, populist, economically progressive, dirigiste electoral franchise, contained within a rational and unified moral structure, is still there. Keeping himself out of the clutches of both party's establishments is the trick.
I've no doubt the the Dems will use their majority to torment Trump and his administration.. likely to their own disadvantage in 2020. The American Electorate does not view Trump with the villainy ascribed to him by the Dem Establishment. He has just lost the focus of his proposal.