To be honest, I do not see this happen at all because of the fact that 6000 dollar is way too much for one bitcoin, I also do not think any altcoin is gonna touch this amount any time soon or even later.
Price can reach $6000 for sure if more new buy support keep coming for bitcoin and actually marketcap of bitcoin is really small right now so still lots of new investment can come in future.
maybe this time we do not believe that bitcoin prices could reach $ 6,000, the same as the price of bitcoin is still $ 1, I think it is impossible to believe bitcoin prices could reach $ 1,000, but I guess it really happened. This is only a matter of time until we could see the price of bitcoin be like that