I'm totally fine with each and every member of the party being in SB gear as long as they meet the iLevel requirements of the dungeon. You, on the other hand, only seem to want over geared players. Must be to compensate for something.
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The dungeons that I SB in are exactly the same that I did before using exactly the same gear. Dungeons where I can't because of level restrictions I avoid altogether.
My position was always that you should meet the dungeon ILevel requirement, even before the change.
What the OP is proposing is a great idea as it would encourage more participation in low level content that may be suffering. I think most people would rather have a 5 minute queue time to party with those who may be SB'ing than a longer queue to get over geared parties.