You got it all backwards.
If the so-called blockchain technology will fail to get adopted by the industry in general, it would have absolutely no effect on Bitcoin. Why? Because Bitcoin is already stable from day one, it never failed in all these years and it is always working as intended - enabling global electronic transactions without centralized middleman.
If Bitcoin will fail, the effect it would have on blockchain industry will depend on the exact reasons of Bitcoin's failure: maybe it will be minimal or maybe it will be devastating if there are some fundamental flaws.
The probability of bitcoin to fail nowadays is very low and so the blockchain technology but for the sake of the discussion I will give my opinion to your "if's". Blockchain technology will survive with or without bitcoin because most of the interest of companies are in blockchain technology and not in bitcoin. Speculators are the one that is much more interested in bitcoin.