Assuming the new upper mast is indestructible, it wouldn't make sense financially. A new composite (not carbon) upper is $495 compared to $330 for a boom. And if the upper does break, it bet it would be in a spectacular manner leaving it completely unusable for a boom build.
All the documentation mentions "ILCA", but we all know the bogeyman in all of this is LP.
While I agree with what AlanD said, I wonder how movitated LP will be to continue cooperating with World Sailing and the ILCA if Olympic status is lost.
Let's assume it is at the upwind mark.
If you gybe first you would have to bear away, gybe, head up, tack, then bear away again. Conversely, you could tack, bear away, then gybe. It seems to me the latter would be faster to do.
Applying the same logic at the leeward mark, you would gybe...
One thing I have seen is a closed line with a 50 boat fleet and a single start. That is a LONG line, forcing you to pick a side at the start of each leg and sticking with it regardless of what the wind does.
With a closed line, you can only cross the line during your start. When sailing other upwind or downwind legs of the race, you cannot cross through the line. The intent is to keep the line clear for other starts. For a open line, this is not a concern.
It only really make sense to use when...