I think the larger problem is network bandwidth rather than hard device capacity. Even with high speed Internet connection (> 20 Mbit/sec) it can take a couple of days to download the block chain from scratch.
lol. You only have to download the chain one time - forever.
People sit in their living room all over the planet streaming movies every night and you worry about 2MB every ten minutes? Clearly you failed your math A levels.
not to mention those same people are willing to download easily from any torrent 60 gb of games, without thinking, so there is must something wrong in their brain function i believe....