With the ever increasing deficits and government liability, something will have to change down the road. Just tweaking with tax rates won't really do it, and economic growth alone won't solve the problem (though everything will be kicked as far down the road as possible).
Two of the most likely new taxes to be introduced, are a VAT (or some other sort of consumption tax), and a wealth tax (as well as some reform in taxation at death).
Now we see an actual idea being circulated. As pointed out in the article it would be challenging to enforce. Which is why I think a VAT, along with an expatriation tax is much easier to enforce (and possibly fairer).
I haven't fully thought through all aspects of a wealth tax, but I actually think it is doable (though the mechanism should be simplified, and the rate set low enough to disincentivize avoidance schemes).
https://www.cbsnews.com/amp/news/elizabeth-warren-plans-to-propose-a-wealth-tax-on-individuals-with-more-than-50-million/What do you see in our tax future?