When the blockchain starts getting into the hundreds of GBs, I suspect that most normal bitcoin users will be using Armory in "lite mode" that doesn't require the blockchain locally at all.
I just bought a 1 Tb disk for 0.5 btc. When the blockchain gets into the hundreds of Gb, we'll be able to buy 1 Pb disks for the same amount of money and I will happily get a disk to store the blockchain and support the network with a full node.