Soon, most things will be wireless anyway. The only thing we'll have to worry about is power. But soon we'll have 12V power everywhere in our houses right next to mains power sockets, so we won't have to worry chunky power adapters. Or maybe Wi-Tricity.
Well, at least I wish the future was like that.
Until then, we'll have 20 different "standards" each more expensive than the other, with bulky cables and adapters, that only work with certain things, that only provide limited power, etc...
FireWire 800 never worked, 400 was the only one that made it into video cameras and pro equipment. When Apple dropped FW400 in favor of 800, my biggest problem was acquiring a cable that has FW400 on one end and FW800 on the other. Trust me, no one has ever heard of that. I could only get it on eBay, not in the real world.
USB was great, but USB 3 cables cannot be plugged into USB 2 sockets, so I don't care what they say about "backward compatibility", it needs an adapter or a special cable, so it's not backward compatible.
MiniDisplayPort never caught on, I got a MacBook Pro with it in 2008 and every projector and screen and TV I have come across uses sVGA or the better ones use HDMI. sVGA is still the standard, and I'm jealous of the people in my class with a cheap netbook who have a VGA port and can instantly use the university's projectors without any adapters.
Ethernet is one giant plug and socket, and only runs a few cables. It's also crap.
Audio jacks are the only ones that have never changed, they're elegant, do not have a "wrong way" of plugging them in, and will always work. Why can't every plug just be a jack? Apple proved with the iPod Shuffle that a 4-wire jack can handle USB easily.
That's about it, I've listed all the connectors on my Mac + all the new stuff that everyone's talking about.
Conclusion: USB 2 is still everywhere and will be for a long time. Most people don't need faster transfers, as the bottleneck in speed is more often the device rather than the cable. Also, most people don't care about daisy chaining at all.