The most important thing to bitcoin is the internet. At the very worst, If the internet got shut out allover the globe.
1. The nodes wouldn't be able to run/communicate
2. Mining would be impossible
3. Transactions would not be possible
4. The value/demand would consequently drop to Zero as people wouldn't be interested in buying something that doesn't work
5. The End
No more, no less. These concludes all as bitcoin is highly and totally dependent in the internent itself. So if ever there will be total shutdown of the internet the it is more likely the end for bitcoin era. No more send and received of datas around, but it is close to being impossible right now as we continue to progress, more developments will occur rather than shutting down. Such situation makes me wonder, what would the world looks like if internet doesn't exist anymore though.