Google has drastically reduced the cost for online service. The cost is now $2 a month for 100 gigabytes. A terabyte for $10 a month.
This price point represents a challenge for storage services such as Box and DropBox. When a folder on your Mac or PC will synchronize with Google Drive, the advantage of DropBox or Box becomes far smaller. What you end up paying extra for would seem to be the upload options that are included in the software/apps from other providers. I can see the free version of DropBox, but the larger capacity plans are going to have to come down in cost.
P.S. – I found this more detailed analysis from Wired that outlines Google’s longterm storage plan.