I don't think the squad revive takes much away from the medics really. The squad revive is so situational due to the time it takes that they are quite rare.
As for there not being enough medics on BF1 that will never make sense for as long as I live. Non-stop heals with extremely strong and versatile weapons and it's not unusual for me to be one of the one or two medics on the team. Lots of players on their bellies doing nothing though (thanks bfv).
Self heals will always draw players to the class.
Give each soldier the ability to be revived just once inbetween respawns and you'd have a pretty balanced game imo
