Thanks, Jack!  
 
I'm not troubled much by the crack as it is now (I never play up that high anyway!), just concerned about it possibly spreading in the future.  
 
I have a luthier buddy who fixed a cracked neck on a resonator guitar for me about 10 years ago; it's been perfectly stable now for all those years. I'm sure he could secure this problem for me.
 
Thanks again!

Good glue is stronger than wood. I have had a couple instruments with neck cracks over the years and had glue injected into them and they were clamped and never had any issues again.
 
Typically, if a neck had a re-glued crack and it got bonked again, the new break or crack would not be in the glue repair joint, because it is so strong.

Thanks for the encouraging comments, everyone!

IIRC, the fix for this is to mix quite a bit of matching wood sawdust (ebony in this case) with a suitable super glue, make a black paste, and fill in the crack neatly.  Then sand smooth.  Will take more work here with the fret and inlay involved, but certainly 'do-able' by the right guy. But that should make it plenty stable and stop that crack in its' tracks.
 
See kids, OIL that fingerboard ! ! !
 
If everything is legit here, that's a deal.
 
J o e y