When has Google ever closed a service that they haven't given you plenty of time and great capability to export all of your data? Not arguing their history of closing services but I'm currently paying $200.00 to Dropbox a year and can convert to Google and pay 48 bucks.
If something happens they decide to close it in the future I'll get my data pulled down and get into another service...but until then I'll be happy to keep my 150 bucks a year!