Look, I think you'll find that many investors are skeptical of these new types of investments, and that they stick to traditional assets, such as shares and whatnot. Warren Buffet isn't the only well known investor who doesn't believe in Cryptocurrencies, just look at Jamie Dimon (CEO of JPMorgan) and all the news articles about him and how he calls it stupid or whatever.

I don't think we need to worry or care at all about what Warren Buffet or whoever thinks, just look at how well Bitcoin and other Cryptocurrencies are doing - and they will continue to do well even with the continued skepticism.