It's always good to have more storage if it can be had at the same price, but this seems kind of "early" to me. the current 64GB iPhones and iPads are the thin edge of the market.
Almost no one buys them. The idea that there is some kind of terrific "need" for this or that it should have happened a while ago seems pretty faulty.
This is Apple being ahead of the game, not behind it.
Eduction primarily uses the 16GB iPads though. There are some 32GB ones out there but that's rare. They certainly don't buy the 64GB ones much at all.
The reasoning there is that the devices are generally bought in groups for class use, loans, etc. and therefore the students don't have masses of their own personal stuff on them. Apps take up almost no space, it's non-educational games, movies, and music that take up the space and those are all personal items not usually found on a set of managed devices.
Additionally, when you are buying in the hundreds of units, an extra hundred dollars each for the next storage bump is a significant factor.