By 2020, I think, both privacy and Proof of Stake will earn more popularity. And in the intersection of the two there are only a few coins, like XSPEC and CLOAK for example. I have invested in both. I am however somewhat more excited about XSPEC at the moment for two reasons. One is the new development team with stable funding, and the other is the soon to come tech of stealth staking, which will increase the privacy of the whole network a lot. Besides, the currently very low market cap of the coin can be inflated easily once we enter a bull cycle again.