To be honest, I'm hoping someone comes up with a truly universal card to end all cards. One which helps with running/developing homebrew games, can be flashed with your own roms, and can emulate Arcade Card Pro features.
Sure, you could argue that adding support for Arcade Card Pro would increase the cost, but I'd rather pay that extra cost to get a fully featured card. Especially when the alternative is to pay 2/3 of that cost to get an Arcade Card Pro, which can only do one thing for a small handful of games (regardless of how good the games are).