What is the most you would pay to trade on a decentralized exchange with no withdrawal limits, global liquidity, good UX, and no custody risk? Maker+taker fees for the lowest volume (retail) customers: Bittrex charges 0.5% Bitfinex charges 0.3% Poloniex charges 0.4%
2/ Eventually, many CEX will have a hard time competing with DEX on fees. But of course we need to get there. DEX is a new paradigm and we need consumer education of its utility. Great relayer UX and a foray into China (kickstart 'globality' of network liquidity) will be critical