I agree that language evolves, but the evolution should be natural and should withstand the test of time before it is considered a real part of the language, even if widely used at the moment. Hep cat, hip, gag me with a spoon. Thats not a groovy, far-out thing. Just like fashion, there are classics that will stay with us, and there are those that are hot today, gone tomorrow.
As far as commas, one little comma can change the meaning of everything.
One little example: Let's eat, people! Let's eat people.
Commas are our friends
