Unfortunately, nothing lasts forever. It may be hard to hear this, but in 15-20 years, most services you use now will either be closed, have different names, be purchased by corporate giants, or will simply be made obsolete. Everything. IMDb, Dropbox, Skype, Evernote, Twitter, Facebook or, yes, possibly even Gmail. When I look at the products I use today I can't think of a single one I was using ten or fifteen years ago. I still sent emails, messages, texts, documents, pictures, and videos over the internet back then, but things change. In fact the only piece of software that has stayed is Windows.
Есть о чем задуматься... Особенно последняя фраза убила ;)