You need to control your data! Now more than ever.
We hate Microsoft, but at least you have some control there. They sell you bad software, but at least you sorta have it in your possession (until they sunset the license / activation servers).
Luckily, I learned a few lessons early on with the loss of Yahoo Photos. I now have nicely named folders of the selected good family photos for relatively quick online upload (again) if I have to move services. Or I can roll my own web server if I had to, just for photos.
You need to be prepared to download your documents and switch your email if needed.
I was about to start up full-force with g+, but after this reader nonsense I went and make an account at joindiaspora.com and tried out Diaspora. It looks pretty solid now and they are trying to do it the way God intended for the internet, open standards and software so you can roll your own. I only use g+ now to bitch and moan about google...