Sure, but it's a tradeoff between authentication and speed, in which many people may want to choose speed.
These types of attacks have been hypothetical for a long time, but we're starting to see real world impacts of not using https, and they aren't trivial.
The Greek government inserting ads into that site is very low on my list of concerns, but the additional 200-400ms on the first page load is much higher up.
Am I correct in understanding your point as "there can be no conceivable case where two fewer TCP roundtrips would be worth the speed gain over the decreased security"?
Unless someone care about a single extra round-trip timing, e.g. extra 10-300ms with 300 being quite a stretch? I'm sure it doesn't matter if a blog page opens in 40ms or 55ms - a reader won't tell the difference.