Agreed that the Rock Band 3 soundtrack has some incredible songs on it. The reality is, getting music for a disc and getting music for DLC (or in this case, digital export... still downloadable -- there's actually a difference... don't ask) requires two separate licenses. This not only means an additional cost on our end to license the music, but additional work on our end to get it done (i.e. more money). We were able to offer disc export at a small fee previously because we could make a business case for the audience being there (and importing) to cover the costs. That's what those "export fees" were; we weren't just being greedy or evil.
At launch, we're laser focused on what we know we can do within reason at first and cover the most ground, and right now, RB3 tracks aren't part of that plan. But of course, this could change in the future . We're trying to do as much as we can to respect customer purchases and bring over a lot of content. One thing (or many, many things with more to come) at a time.
Keep in mind, a lot of this thinking applies to other features you're asking about that may or may not be in the game at launch. Lots of stuff to do and we'll get to most of if, but it's a big project. It's also a live service game, which means we plan to continue updating it (read: making it BETTER AND BETTER) after launch.
Also, yeah, stop yelling at us about Breakneck Speed.