Emojis: I'm with you. This seems dumb but I'm optimistic that people will find clever ways to use the screen. Even if it's just pushing away moronic "toast" style notifications off the important real-estate.
USB / dongles: In two years, almost all peripherals will be USB-C and C-to-A adapters will be tiny and cheap. USB-C will be the new Thunderbolt and it'll end up being more convenient. I'm looking forward to sharing displays with ultraportable Windows machines and chromebooks using USB-C.