While I don't see this ever happening, which I agree with, it's probably going to be for the "wrong" reason. Both live and broadcast audiences want to see the yardstick and graphic overlays to gauge performances and results instead of having no idea what's going until they get the answer, so for the sake of the audience they won't change it.
The better reason not to change it is because timing the leap is part of the skill requirements.
Long jumping as a skill is useful for crossing crevasses, rivers, etc, bridging the gap, and if you don't time it right there can be consequences.
But there's at least one sport that's implemented what's essentially dynamic or fleeting inputs: ski jumping.
Ski jumping is:
- Sequential. One jumper at a time. The entire procedure takes between 1-2 minutes per jumper under normal circumstances. Same as long jumping.
- Point based. You get points for distance, and points for style. The style points take distance into consideration, so you don't earn high style points for short jumps.
- Gate and wind compensation. Points are added or removed depending on the wind conditions and start gate used (starting at a higher point in the hill gives more speed).
This means that the athlete with the longest jumps doesn't necessarily win, and that two consecutive jumps of equal length might yield very different scores. With all this ambiguity the sport is still wildly popular in its domain (it's likely the second most popular winter sport after ice hockey).