Bitcoin is growing very powerfully but in this present scenario which factors can destroy or make its market value Zero.
I believe there can be few factors that can impact
1. Better crypto currency
2. loss of human interest (I believe BTC is a human mania like dutch tulip mania).
3. Mass cyber attack
4. World war
Even most of replying saying non can beat BTC, check the recent past, yahoo was once one of best search engine and Nokia was leading in mobile phone world. Things getting change.