They are working on scalability related issues like POS and sharding for some time, and I think they already have some solutions, but the fees on EOS are much lower, it seems more like the kind of cost that you'd expect from a transaction system that runs on computers. I still think EOS is too close to Ethereum. There might be many viable alternatives to the old blockchain protocols. There are already attempts like IOTA and Hashgraph, however, Graphene platforms made solid progress. You might be right about EOS eventually becoming more popular, though, and I agree that transaction speed (&cost) is obviously the major technological, and measurable indicator of success here as this article argues. There is a comparison between EOS and ETH here.