eh? While I don't doubt the influence of the internet on various topics, I don't thing it is true to say that Brexit was entirely an internet phenomenon.
I well remember seeing miles and miles of placards advocating "Vote Leave" in Derbyshire. Further, among the many people I know who voted Leave, my, shall we say, more mature acquaintances, are not internet users. Among many of my younger acquaintances who voted leave, they simply voted against the "toff" (ie Cameron), not for Brexit.
In terms of the original subject (ie The Monarchy), I agree, they should go. Perhaps too late for William, but, he should be the last, and, the ball should be put in motion to ensure his children have a "normal" life.
I don't see the need to have anything to replace them, no point in replacing one lot with another lot.