In my opinion these predictions are well possible if we have a slow growth. We can't say what the future brings and we didn't have something like cryptos yet.....
Maybe they'll all fail because of bugs what's very unlikely imo. But if they fail, they'll be more or less worthless. I don't think that any entity be it banks, investors, governments or whatever can seriously harm them on purpose. So if the community can solve the technical problems (and I trust those guys...) cryptos won't fail imo.
Bitcoin is a new kind of a currency and it's a great one imo with many big advantages over others, I don't go into details here. It's still some "hassle" for a newb to get bitcoins or other cryptos and few stores accept cryptos yet. It's changing slowly and cryptos are more something to invest into atm. BUT things could change rapidly now that more and more ppl are aware of cryptos and the fact that they work well.
History has shown many inflations and often times people in countries with high inflation used foreign currencies because they didn't lose their value too fast. Now that cryptos are available and most of the people walk around with a quad-core-computer (smart phone) in their pockets, why shouldn't merchants in such a country prefer the "easy" to get cryptos? if that happens in just one country the so called market cap of something around 100bln $ that bitcoin currently has is just nothing in comparison.
So x10, x100 or even more are possible in the near future imo. But we could also see x0.0001.. I for myself doubt that and think btc will be worth more than 20k USD in 2 years maybe even more than 100k, it'll maybe take more than 2 years but I'll hodl some, alts as well.