No. The investors will stay. The pump and dumpers will go. Once the coin's difficulty can change more quickly based on the hashrate, the coin's value will be more directly proportional to the difficulty; if the value goes down, THE COIN BECOMES EASIER TO MINE. Right now this isn't possible. After the fork it will be.

We're stuck because we can't get out of the current difficulty. If the coin does lose value, because of the change after the fork it will become profitable to mine, which then brings back more hashpower, more miners, and the value goes back up.