Now we have SSD which means a small one-step-backward for storage. However, we will supposedly have 10TB SSD and beyond within a couple of years which should give some breathing room.

Even with all this development, I doubt we will be able to have everything on Github locally on our computers. I imagine the typical Github project to be tiny -- probably tens of megabytes at the most so I'd say we can have all the projects that we care about available locally. One can only care about so much.