What's bad if we will see blockchain in many task? BitFury actively works on developing and integrating blockchain system and their last project in Georgia was very successful. If something is good, of course it will attract people and there is nothing bad in it.
Someone said here what will happen if internet shut down in this world :S haha it's simply impossible and people can't imagine if this happen.
It doesnt matter at all that internet will be shut down in the most of the country on Earth, if there will be at least one full node that is still working.
That one, last node will still contain whole bitcoin stored on the hard disk, all chains, every transaction etc.
Take a look from the other perspective: if Internet will go off, the banking system will not work too, but blockchain will survive thanks to the idea of Satoshi Nakamoto to develop it this way.
In fact, I have no idea what would have to happen to see internet not working at all on our planet, maybe a nuclear war?