I’m not sure I’m understanding you here. Kneeling has more of the proper connotations than standing; it incorporates reverence, respect, devotion, love, and supplication. Yes I’m speaking in the west, where these connotations exist. In the east, the same meaning may not be attached to kneeling, and that’s fine. The east and west are not interchangeable in symbolism.
It would, to the average pew goer, reflect a break with our traditional and orthodox understanding of our relationship to God. Standing has never, in the west, in any shape or form, been a posture of petition or supplication for example. It is more traditionally a posture of equality. This would feed into the modern New Age ideas of “we’re all God”, and this needs to be avoided at all costs in our particular time when these ideas are so popular.
Yes we stand at other times, but these are broken up by kneeling. I’m not saying standing is bad at all times, but we need to counterbalance it with kneeling. Having us kneel at some parts and stand at others gets rid of the connection of “equality” that is in standing by counter effecting it with connections to being servants and adorers.
The attitude we should have at Mass is a Christ centered devotion, adoration, and reverence, in both East and West.