If bitcoin died tomorrow, I will exchange (buy) a lot, I believe we still need cryptocurrency sooner or later.
If Bitcoin dies, it happens forever. Nobody will spend money on mining rigs because the profit will never exist again. Buying a lot is a bad idea because it will just fail completely afterwards. I hope this won't happen, but we never know. Bitcoin rising too much means a problem because it will happen like in 2013: after the rise comes a big, big decrease.