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There's also suspicion, if I recall correctly, that the routine repetitions of linemen taking knocks to the head in practice does more long term damage than what we see on game day. This may be more pronounced in high schools and to a lesser extent, college, where the coaching can be more suspect.

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Yes, research has suggested that a number of smaller collisions can cause damage even if a player never suffers an actual concussion. A helmet also only protects you from external trauma. It acts as a second skull. But the problem isn't always from external trauma. If you are moving at speed and you are put to an immediate stop due to a collision with another player, your entire body experiences a lot of force. Your brain will end up colliding with the inside of your skull due to inertia regardless of whether you were hit in the head or not. That is why simply cutting headshots out of the game or removing helmets won't be enough to protect players. It really gets down to the fundamental nature of football and the physics of its collisions.

Analogy I've stolen from a Uni. of Toronto brain doctor: fill a mason jar (skull) with water (cerebrospinal fluid), and throw in a golf ball (brain). Shake the jar, the golf ball will hit the side of the jar.

You could bubble wrap the jar (helmet), but the ball will still collide with the inside of the jar.

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