AWS Glacier is probably the single cloud storage that hasn't seen a price drop. It used to be the cheapest storage solution by an order of magnitude now, it's MORE expensive than... Dropbox. Is it a sign it's heading for the deadpool?
I think Glacier works on very different principles, for very different scenarios. Dropbox, Drive...they're more for everyday usage. Glacier's more for archived storage, where you're looking at a platform to store historical files, that aren't used everyday, but you never know when you might need them. IMO, I'm not entirely sure it's accurate to compare it with Dropbox, in these terms.