Looks like you don't understand real risks of increasing block size. If hard drive is the only problem, i would support block size up to 16MB by now .
Have you consider amount of bandwitch needed to broadcast transaction/block? Have you consider processing power required to verify each transaction/block before it's broadcasted if it's valid? Have you consider risks of more orphan rates/slower propagation speeds?

I'm not against increasing block size, but without make sure most full nodes are able to continue run smoothly after block size increase, it's very risky.

More info :
1. https://en.bitcoin.it/wiki/Block_size_limit_controversy
2. http://bitfury.com/content/5-white-papers-research/block-size-1.1.1.pdf (Outdated and not sure if it's accurate)