I think the most valuable coins will be the native tokens of underlying blockchains with entire financial systems built on top. In other words, the base layer will be the most valuable - and the most likely base layer will be POS coins such as ethereum, cardano, neo, rchain possibly. Coins built on top of these chains will have value but won't have 'root' value, so to speak - think auger, BAT, Maker. It remains to be seen how this will actually play out long term.