33cl is quite widely used - of course it has the advantahe that every time you spit 1l into three 333cls, you have a profit for the house of 1cl - and with big quantities that stacks up.

"I'm for change and progress" sounds easy, but it all depends on what it actually means. Going forward, when you on a cliff edge, is a kind of forward progress that is best avoided, and dropping dead with a heart attack is definitely a change, but it's not generally felt to be a change for the better. And fashion isn't always the same thing as progress.

Both systems have some advantages. Going back to the old one would be more trouble than it's worth in Europe, but I think you'd probably be best off sticking with the old ways in North America.
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When it comes to wood, sure it's easy enough when it comes to length - but a lot tricker when it comes to the other dimensions. You want a one inch plank to mend something and the only thing available is a metric measure which is over or under an inch, what are you supposed to do? Buy it big and plane it down? (And of course that would apply if the change had been the other way round.)