People buy lottery ticket all the time, thats total fine, spending $5 here and there for fun. But if you mortgage your house to buy lottery tickets you are crazy.
Same thing with bitcoin. Spend a few grand for chuckle is fine, chances are you wont see your money again. Heck I would pick up a few bitcoins too when it drops below $100.
If you spent your life savings buy Bitcoin, get out now while you still have something left! New crypto currencies are coming to replace BTC. Stop torment yourself everyday watching your money goes into red day after day after weeks after months.... you will spend your retirement working at McDonalds trying to earn it back!
That would really hurt if they loose all their savings specially if they had invested all in bitcoin and it goes down all the way. But i think it will not happen bitcoin will recover we just have to wait and believe and do not invest all your lifetime savings into one basket keep something for the future.