Just to be clear, I'm sure the engineers at Google are trying to do what they can do deal with the spam problem, as quickly as they can.
I'm just feeling cynical about Google's motives and actions after what they've done with Google Reader, CalDAV, etc. Yeah, they're a for-profit corporation, but it's disappointing how they seem to be moving away from open standards.
At this point, it seems like they're looking around and saying: "Hey, we have a proprietary solution, and an open solution, but it costs extra to maintain both. If we shut down the open solution, we save money and get extra lock-in too. It's win-win! -- for us, at least."
So I'm slightly worried that when a situation like this comes up, the managers at Google (or managers' managers, or wherever the directive is coming down from) are just going to say "do the minimum amount of work and get back to that other project we have you working on", where implementing solution that's good for the users is not a priority.