“Punkt the segment of Klal Yisroel which has the disparity issue.”
Only a subset of that segment has the disparity.
“The present chachomim don’t want to rescind the ban to “solve” the shidduch crisis”
That’s merely your speculation about their motivation for not having acted yet.
“only to make a much worse sholom bayis crisis.”
That’s your opinion. (Remember, even if enacted it would still only be done by a small minority of families; and they will be selective in who chooses to, and is able to, do so.)
Everything you’re saying about this, you could’ve equally have claimed about the crazy idea of pushing for closer in age shidduchim before the Gedolim came out in support of that initiative.