I understand that. I just feel like "cables" are old news.
In some ways they are but it's also a key feature for the success of Android as a platform, especially an open platform that is going to find it's way into many different use case scenarios. We are starting to see a lot more wireless devices but it would be ridiculous for everyone to go out and replace all their existing ones that function perfectly. For example, I would not need to purchase a keyboard dock for an Android tablet now, because I already have a perfectly functional wireless keyboard and mouse that operates via a small USB dongle. I have a HD webcam that is USB, of course phones and tablets have cameras, but something like Google TV doesn't, so I'd be able to use it on that. As well as different audio devices and all kinds of different things. Something like Skype/video chat seems to be that it would be much better suited to be used via your TV rather than how we all use it now on computers and phones, and I don't foresee TV's coming with integrated webcams for a while.
With the speed of USB 3.0 which is just starting to show up in various places, for some things it will be a lot more feasible to connect via USB compared to wifi or bluetooth transfer rates. Particularly with larger files. Given that Honeycomb ships with what by all account is a very good movie editor app, you could carry a portable hard drive that contained a lot of HD footage and be able to edit it on the go, etc.
I could sit here all day listing scenarios but you get my point.
For me I believe that one of the key reasons why Android has been decimating the competition and will continue to do so, is because people like to have options. Adding USB hosting support allows people many more options as to the usability of their device. And it's actually been one of the top 5 most request features that developers have been asking Google to implement into Android since literally before the G1 was even released.
I mean, you wouldn't buy a computer without USB ports, right? And the more different places Android shows up, the more important this becomes.