A triumvirate of Unions, government, and private enterprise are supposed to be balanced and keep each other in check the same way the three branches of government in the United States are supposed to keep each other in check.

And just as the executive branch has bloated into a monolith at the expensive of Congress, private enterprise has bloated at the expense of Unions (just as true in the U.K. as far as I can tell).

You have the two primary governmental/economic systems of balance failing in the same way, at the same time, both failing due to the actions of corporations.

This kind of failure may be common with liberal democracies but is not inevitable. We have simply been bad stewards and let corporations vacuum up everything with little resistance.