In my opinion the future will be for cryptocurrency which is very guaranteed if many people use or invest in it.
That's why it needs to be splendid globally and mainstream media is so important for global spread out. But for these sudden distress happening on the market make people annoy so we really need a good news like legalities nor anything could boost, or maybe government ruling will create a massive impact on it.
Scalability always being a problem on cryptocurrency, example like Bitcoin everyone always debate about that. But atleast we already have some solution for that Segwit & Lightning Network. To be honest for future cryptocurrency always make some new progress about their development.
the biggest obstacle in bitcoin is price stability which is always a big problem. because price stability is always a determinant of profits for traders. if cryptocurrencies are made into global currencies to replace the dollar, the standard of currency values is very important, but in the future this can get the best solution.
Price stability could be bad for people who don't understand how tradings work but for the people who knows about it they would love to see those actions since every upwards and downwards movements is glory days for traders and we cannot earn if we can see only a price stability on it.