In addition to the points made by 'thesimon' about OneDrive pricing:
Apple's cloud storage offering includes 50GB ($12/year), and 200GB ($36/year) tiers. I'd bet 99% of Dropbox users could fit in one of those tiers and save a lot of money.
I have a 1TB OneDrive and 200GB iCloud, but I spend money on Dropbox because I trust them to be reliable. If the others catch up on reliability, where is the path for Dropbox's survival? (They're smart guys, so I'm sure they've thought about it)
[citation needed]
Office: http://www.amazon.com/Microsoft-Office-Personal-Year-Card/dp...
$57 for 1 year of Office + 1 TB of storage
Dropbox: https://www.dropbox.com/plans?trigger=homefoot $9.99 for 1 month of dropbox with 1TB (=> $120/year)