However, the reason it was decline was because of useability testing against Flat Sequences:
"Flat sequence structures have been proven through usability testing to be more readable and adding this functionality would encourage more people to use stacked sequence structures. "
Surely this option makes the Stacked sequences more readable, so another useability test (with the modification) might prove that Stacked Sequences are more useable.
The reason I use stacked sequences is so that my code does not require miles of horizontal scrolling. Even using Sub Vi's for everything, code still gets very long with the conversions between data for the sub vi's
National Instruments will not be implementing this idea. There is no further feature development planned for Stacked Sequence Structures.