I have a "soft" cap here in NY of 20gb per day, but it has never been enforced, but that is at a pathetic 2-3 Mbs over DSL. At my apartment in Tokyo I can stream HD video 24 hours a day, 365 days a year with no throttling, no cut offs and no up charges (it actually says that word for word in my contract). All at 100+ Mbs over fiber optic and all for 4500 yen per month. If Japan can do it, so can the rest of the "modern" world, it is called greed folks, most internet/cable/phone companies prefer to keep the technology old, prices high and profits high instead of reinvesting into the network. So they cap the data, throttle the bandwidth and then charge you more for crappy service.
As for Lion, bring it on, I am looking forward to it, and accept the fact that it may have quirks and bugs. I do agree, having a Time Machine/bootable back up is a good idea, but I honestly do not think it will be so unstable as to render your machine useless.
I also support the download option, I think it is time we move on from CD/DVD and other landfill producing waste products, I mean this is the sort of thing the internet was supposed to free us from. As for those people in areas with poor or no internet connection it is a problem, but technology moves forward and we cannot continue to hold back progress of the many for the sake of the few. Honestly, CD/DVD media is dead for a lot of people and that trend is only growing IMHO. My guess is if you go to an Apple store.WiFi hot spot you can download and upgrade as needed all for the cost of an hour or two and some coffee.