The point is, in case you truly didn't get it, is that these guys are a scrappy start-up (which, we hope, isn't burning money into a fiery pit of despair), and Webvan is a too-big-for-its-britches lumbering incumbent.
Good luck guys - Instacart seems like it's got amazing potential and I hope you guys do wonderfully.
Start-ups that 'succeed' (buyouts, etc) for their founders can still fail before making any real difference in the actual marketplace.
Nothing against Instacart, but that first picture must become like the second before history will call them 'successful'
Also, "historically notable" is a pretty high bar you're setting.
Finally, I'm sure Instacart hopes to reach that kind of scale eventually. But they don't want to start there because again, that's how you fail spectacularly and lose tons of money without giving people something they want.