A good estate plan does not work in a vacuum, but avoids generalizations about tax laws and creates a unique plan that will work for your family. The recently passed tax law creates a challenge, according to Financial Planning in "Avoid 'dangerous' planning generalizations after new tax law."
One of the more important things to keep in mind is that public opinion polls suggest that the tax cuts are unpopular. If they remain so, then it is possible that in 2020 things could easily swing back the other way.
The tax cuts could be reversed and there might even be tax increases.
Therefore, you might want to be cautious in making too many sweeping changes to your estate plan, especially if they are irreversible.
An estate planning attorney can advise you in creating an estate plan that fits your circumstances but also is flexible enough to adapt to changes in tax laws.
Reference: Financial Planning (Jan. 3, 2018) "Avoid 'dangerous' planning generalizations after new tax law."