I will buy XDAI when Ethereum 2.0 launches and the projects above actually prove their theory. Filecoin currently announced will help the Ethereum network reduce transaction costs. I find Ethereum very difficult to scale and the Ethereum network is very heavy and sluggish.
I came across XDAI, their technology is very good and there are a few projects that have learned from XDAI to include their products. As in the post, the potential of XDAI is enormous.