Interesting question no doubt. The current architecture will be passed up before we know it and all the languages that are being used now will be long gone. Not saying this will happen over night, but once new technology arrives we all embrace it and say goodbye to the past. When you look at the web today compared to 10 years ago we have not made too many advancements IMHO. Just more fluff.
A lot depends on the companies investments into the computers of tomorrow as well. Just my 2 cents.