I think the steering will get pretty wobbly at some point in the near future. I am not a Ti welder, but I think this can be fixed fairly easily. But I would ask a good ti welder that does repairs. I'm not sure lynsky is your best bet. OP doesn't list a location, but Ti welders that do repairs can be found around the U.S.
Do not do any of the hack repairs suggested above, especially if they involve adhesives. Sheesh. A stop hole by itself only weakens the tube. It doesn't really help if the crack is welded, but the effects are removed.