But what you describe is a networking problem (transit costs of your ISP passed on to you). Not a storage problem.

A "cloud storage" provider is just going to keep the data you store in a datacenter near to you anyway, not halfway around the world. But it's not like keeping your physical stuff with a storage company. You can easily store the data yourself with many more advantages. The marketing teams for "cloud storage" services will no doubt try to convince people otherwise.

How does "it is getting harder and slower to move large files over the net" lead to the conclusion "therefore we should store all our large files on the net and retrieve them whenever we want, rather than keep them on local media with negligible latency and huge storage space"?

If at this point, there is no local storage, and it's stored in the cloud, you need to pay the bandwidth price every time you wish to view it, rather just on taking possession.

This particular example, about Canada increasing bandwidth charges, actually works against your argument.

Sure, some data won't need to make it to the client, but that's mostly only true if your a scientist, or otherwise run computation on data, but that's hardly the case for the general person.