Re: I've read somewhere in 4 years the block size will be 700GB
Bitcoin was designed with the advancement of technology in mind. The whole difficulty adjustment thing is to ensure that, even as CPUs get faster, we continue to get blocks that are 10 minutes apart on average. If you feel that expecting technology to continue to advance is wrong then you should find some other hobby. Forget about bitcoin.
Condescending much? It's like arguing with creationists! 
It's not a case of forgetting about bitcoin. It's about preventing it becoming purely a back end service for VISA, Paypal and Western Union.