I'll give you the no warning to the users as they do not pay attention to this and there will probably be some "Why doesn't x run in 10.7?" threads here come next month (along with "Where did Java/Flash go?"). They really should be more explicit there.
But I seriously cannot get behind your argument that developers were blindsided here. Rosetta was a transitional technology, just like Classic. It was meant to ease transition and then go away. I could understand your point if this was 2007 or even 2008. This is 2011. Relying on something that is clearly transitional for so long is blatant sticking your fingers in your ears and yelling "I'm lazy, lalalalalal!"
This isn't like Carbon 64 where Apple was supporting it only to pull the rug out (even then there were some hints but it doesn't excuse Apple for faking devs out like that). Over half of Rosetta's webpage back in 2006 talked about talking to your developers about upgrading or sidegrading to a universal version of the app. Isn't that kind of a hint there?
I'd like to think being a good developer is being able to pick up on which direction the wind is blowing so you don't end up in a dead end and out of gas.
