Bitching about the storyline when we haven't seen shit is useless cmon
You must be new to this thread. People were bitching about the game for hundreds of pages before we even had the gameplay. Or any concrete info for that matter.
bolster his forces by kidnapping people.
Did you people even follow the conversation??? It was spelled out for you,a few times,that it takes 20ish years to make tentacleface.
So we have 20 years to seek treatment? No pressure.
But on more serious note - it was suggested by the Gith-woman that the worm is making its host better, instead of worse. We can even see that directly by seeing the changes for the Vampire Spawn. It's also possible that it could be trying to achieve symbiosis of some sort and that the process of becoming tentacle monster is accelerated somehow (otherwise why the sense of urgency?).
Keep in mind that the theme of corruption is going to be present, so expect to be able to join the Illithids (and probably killing everybody who doesn't share that idea). I sincerely doubt that we will have to wait 20 years for that to happen.