I just don't agree that b-lines equal dumbing down a trail. The new flow trail at Reimers Ranch has b-lines and they don't do do anything to affect the a-lines. They are planned routes around the more advanced feature to discourage people from cutting their own lines. Not to mention having fun. This is what the issue is - people cut there own lines because they don't want to walk. No matter how hard you try, it will keep happening.
Also, I do get off and walk. I get it. I'm talking about a solution to the issue, not my own behavior. I don't alter the trail, but a can get behind the idea of making the trail more inclusive while not removing any of the existing features - like the log. Somebody did that because they were annoyed that they had to get off their bike. How do you keep that from happening? Maybe, if there was a line that allowed whoever moved it to roll over it since they can't hop it, they would have left it alone for everybody else. How does that hurt, or dumb down, the trail? Moving the log dumbs it down even more.