The only way in which Bitcoin can be destroyed is the  reduction in its demand.The demand can be reduced by two factors.One factor is if the government of all the countries declare transactions through Bitcoin as illegal then it will surely have a adverse effect on its demand. The other factor can be if some other form of cryptocurency replaces Bitcoin.The demand will be shifted  and the price of Bitcoin will drop down.

Bitcoin's current value is 4200$ which is near about 10 times  to the value of any other altcoin and it is still increasing at a very fast rate. So i dont think that Bitcoin can be destroyed.It is the time for Bitcoin to rise and to achieve its All Time High Value.