1) I know the comic was long, but they explicitly cover their agenda -- they're taking the time and money to make some hard decisions about the browser that really need to be made (or at least investigated), like separate processes per tab / embedded-object, aggressive javascript revisions and embedding features that are relevant to the new world of applications design.
2) Mozilla sending impressions to Google is still money in Google's pocket. Judging from Mozilla's $millions cut, it's handsome change, too. They have no incentive to kill this golden goose.
3) With all due respect to the (tens of?) thousands of people that have contributed to Netscape/Mozilla/Firefox, why should we even care about Mozilla/FF? When the Mozilla codebase was open sourced, it was roughly equivalent to NS6, which was a dog compared to IE (remember why even the majority of geeks was using IE5/5.5? NS4 was an ancient PoS and NS6 was glacially slow and horrendously unpolished). A lot of us only cared about NS because it ran on the open source OSes we preferred to use, and it represented an alternative to the MS-only world we saw coming our way otherwise. I don't see how Webkit isn't better than the Mozilla codebase in any metric you can throw at it.
Conspiracy theorists: Stand down. Sure, a monopolistic Google would be as bad as any other monopoly, but I don't think this is the keystone piece to the formation of the new evil empire.