I think EA has hinted at it in a semi-recent post but you are correct.
Adding platoons back would be one of the most significant changes they could make to this game aside from the glaring bug fixes.
Having a "join as platoon" would be huge and create the community environment that BF used to be known for. This is one of my biggest gripes to date.
I am used to playing a few select BF4 servers and recognize more than half the names of the regulars. Sometimes its the whole team on both sides.
This would also help make portal much better and it would allow platoons to create their own gaming experience like the good old days.
If BF6 wants to survive and thrive this is a must.