I think many of these companies are looking at the very real possibility that being relegated to being a 'Western Country Company' may not be the best financial strategy long term.

That said...Twitter is too late. I don't think many Chinese young people will switch at this point. They have already missed the boat on micro blogging in China, they should at least keep their ideals...now they will keep their ideals and won't get the Chinese market anyway.

Although when I consider the matter more fully...the world is bigger than China. Some of those other nations may be important markets going forward...and they may have some censorship laws Twitter would have to deal with. Indonesia will probably be the second most important nation in Asia in the future, and I think Twitter hasn't lost yet in places like that. And Indonesia probably has things you can and cannot say.