If you have seen some on-screen glitches or noise, I would think the flyback would be about to fail. But if you are not seeing anything unusual, I wouldn't worry too much about it.

I have a very different problem on my SE/30's flyback, and it works just fine even with this metal part broken in two:

https://picasaweb.google.com/103365672326265854011/SE30MicronXceedGrayscaleVideoWithDaystarSnapOnAccelerator#5641720139650991042