Will we ever have to and from fiat conversion available in the wallet? This would go a very long way in adopting and using Cardano. Currently, using exchanges is a rip-off in fees and a headache in KYC-AML rules, plus maximum daily/weekly withdrawal limits are the worst.
If we could easily convert ADA to/from USD and EUR, that would be a game changer for many people. I suppose second best thing would be a trusted, high liquidity DEX that offers fiat on/off ramps.