Most thinking on the wealth gap does not call for equality as a solution. Most economists concerned w/ this problem would be very happy to simply reverse the trend (actually going back a number of decades — part of numerous cycles through history).
The last 8 yrs. in particular have seen a marked increase in that gap. Parity is impossible. But there has been little done in the last several decades to finance the demand side of our economy in the same way as the supply side.
Government’s primary responsibility is the greater happiness of the majority of the people. An increasing wealth gap increases unhappiness. If government is serious about reducing the wealth gap (under Trump I have serious doubts), the most efficient way of addressing that problem is to directly finance those who are most responsible for consumer spending. That may involve quite a number of initiatives that I could not at the moment define.
The American consumer is the greatest American economic resource, yet that resource has been neglected.