Bitcoin cannot crash nor go down against the dollar. You can print as much US dollars or fiat currency as you want. BUT YOU CANT CREATE MORE THAN 21 MILLION BITCOINS. If everyone just realize that fact, it would never stop going up. It seems like the idiot stupid fools that are selling since December don't know that. It is just as simple as that.
I agree with you but nothing can constantly go up including bitcoin.Only noobs don't sell.Big whales do too to earn profit by dumping. 
I know bitcoin is undervalued still.I know it will surely one day be worth 50x than today.But it won't happen constantly.It will happen by pump and dump like it always happen with bitcoin price
