I don't think that this is dangerous, and it doesn't go through the frame, but it is spreading. My bike is dying at 20,000 miles. I have seen $4,000 frames crack, so I guess this shouldn't be so strange, especially since it has been abused by TSA on multiple flights.
Anyone out there have a frame they want to get rid of? Also, the frame has been changed a fair amount since 1995. This is a 2005 frame. Anyone know if they are all compatible with the rear swingarms? Or do those have to be replaced as well.