Hello Mindy,
hmm...It's hard to imagine these timeless and philosophical words should come from such a lovely young lady...
But, I bet language won't change overnight, like, "It's a piece of cake." today and, "It's a bit of gay." tomorrow, meaning the same thing.
Language takes ages to develope and it varies with times, social communities and classes, areas...English is a very diverse language. If you ask ten English speakers, you will find that they will all disagree about how they say some things.
However, people have a bit of a higher standard toward written English, especiall on signs for the public, and any printed mateirials. On the other hand, as non-native speakers like us, it is advisable that we choose one system to learn(Pan British system, including Australia. an New Zealand, or North America system). And stick to what is commonly accepted in that system contemporarily. Pick up some from the other system only if you are available.
I don't worry too much about "tomorrow" when the language changes. Do we worry about what our mother tongue is gonna be like in, say, 20, 50, or 100 years???
No way!!