Many interesting POVs here, some of which I might even agree with.
I think B6 will do quite well, but I don't see it expanding so much as to be significantly troubling for BA. One of the things against B6 as it expands is lack of alliance membership. That hasn't held them back whilst their service area has been pretty much restricted to North America, but once one starts playing in the global arena it becomes harder to expand without being an alliance member. I'm not saying they won't be the exception that proves the rule, but it's going to be a tough fight to become more of a global airline without that. My 1p/2c worth. YMMV.
rb211.