What we know of as Business Class today, is pretty much First Class from 20 years ago, Premium Economy is what Business Class used to be, and longhaul Economy today - well - it's the equivalent of rowing the boat aboard a Roman galley.
There are two very good reasons that many of the biggest carriers in the world will continue to offer full First Class service. Carrying the cost of the high-end seats makes it clear to all other passengers - and to the rest of the travel industry - that your airline is a seriously prestigious operation. It's a huge marketing tool.
Secondly, loyalty programmes are a key part of any airline's business profile, and it helps to be able to bump up regular customers.
Mr Bruetzel, I say to you, sir: You may take my liberty, but you will never take my Dom Perignon Rose Vintage 2003.