I am of the opinion that when there's a global economic crisis that cryptocurrency would be affected negatively.
Anything may possible. Even the short term impact will be in negative, we can expect more investors rushing to bitcoins which may bring positive things later on.
In global economic crisis people would because trapped and so won't have enough for cryptocurrency investment which will make for decreased demand and high supply.
That will not be true. If economic crisis will be arising then we can expect institution funds will be moving out of stocks and bonds and may go to gold and cryptos kind of alternative mode of investments.