Peter does not know what he is talking about... the potential for Bitcoins to grow more in value is there and it just needs time. It was $1 in 2011 and now $4K in 2017, if thats not successful in Bitcoins, then I dunno what it is :P
I made a post about many people freaking out when the crypto market plummets, here are my thoughts on it, you may find it useful: https://steemit.com/cryptocurrency/@denoxblogger/cryptocurrencies-dropping-heavily-in-price-worry-no-hold-them-bitcoins-and-litecoins