Other measurement systems definitely have their uses though. Many older measurements still exist due to them being easier to estimate with; e.g. an acre being the amount of land you could plow in a day.
And you'll never have the British drinking from litre glasses, I'm afraid. It's pints or nothing.
"an acre being the amount of land you could plow in a day" isn't that an extremely subjective way to measure something? And to almost everyone even modern farmer is that actually a good basis considering a modern farmer can most likely plow much more than an acre in a day with machinery?
Oh absolutely, if they updated it to be based on modern farming then everyone would have significantly less acreage :D
But you'll find that with most imperial measurements; they're based on physical objects or systems of measuring which make less sense today. One of my favourites being the traditional way of counting sheep in the north of England: http://www.fellpony.f9.co.uk/country/wool/count.htm (and here's a great explanation and song by the late Jake Thackeray: http://youtu.be/TiXINuf5nbI).
Sure, not from litre ones, there's too much binge drinking already :) But the half-a-litre glasses, common in metric countries, are a very close replacement to pints in terms of volume.
And you'll never have the British drinking from litre glasses, I'm afraid. It's pints or nothing.