First of all, bitcoin network reached 7 million TH/s and its computing power is above any other single supercomputer we have on earth. Just to give you some prospect of how powerful bitcoin network is, here is article - The Bitcoin Network is 11000x Faster than the Top 500 Supercomputers Combined: http://jasondrowley.com/2015/12/04/the-bitcoin-network-is-11000x-faster-than-the-top-500-supercomputers-combined/ Just note, the article is from 2015, since that time we had a tremendous rise of hashing power.
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and "what about the future" arguments are also pretty invalid. as computing power gets stronger so will the network hashrate.
the only way bitcoin is dying is if people stop being interested in it, using it, mining etc.