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Google Search is losing its 'cached' web page feature
(www.engadget.com)
This is a most excellent place for technology news and articles.
Websites will never change their URLs today.
i maintain redirects for old URLs for which the content still exists at another address. i've been doing that since i started working on web sites 20-some years ago. not many take the time to do that, but i do. so there's at least a few web sites out there that if you have a 20 year old bookmark to, chances are it still works.
Sites are actually 83% less likely to go offline these days.
Source.