Most people are misunderstanding the "fix." The cut and JB epoxied section of steerer would be glued to the stem and serve only to thread the headset onto, right?

It's still a bad idea, but not as life threatening as many have implied (or stated).

The JB will fail, and then you will have a very wobbly front end. Most likely to happen standing and wrenching the bars on a climb, I would think, but it could absolutely cause a bad crash if it pulls apart downhill/in a turn.

I would convert to threadless or find a new fork or frame.