In terms of fidelity to Scripture and Confessions, yes. But not numerically.
Main national bodies by size:
ELCA
LC-MS
WELS
LCMC
NALC
You might, more accurately, review which synods’ members actually show up for worship on Sundays rather than merely list claimed membership numbers. I received a post card a year or so ago from an ELCA church that I hadn’t been a member of for decades and yet they still carried me as a member.
What keeps the LC-MS, WELS, LCMC, and NALC from becoming one?
Many are called few are chosen :)