What would a modem update do to fix a hardware error?
If I hold my hands tightly around a 3GS I can replicate the signal issue because I am blocking the signal. Of course almost no one does that which is why there is no 3GS signal issue.
The problem with the iP4 is when you touch the antenna where it connects to the ~receiver (death spot) you (fill in the blank) thus causing it to lose signal strength. A software update isn't going to fix that hardware issue.
A software update could increase the speed at which the phone adjusts frequencies. (The i4 reportedly
lowered that from past models so that it would place less demand on cell towers.) Or it could increase the amount of power the radio sends out so that it gets through obstacles easier. Both would make the battery drain faster, but perhaps people would be ok with that.
Either one of those changes could potentially alter the way this issue works. If your hand changes the frequency but the phone can keep up with that change...well then it won't really matter.
Will changes like that work? I don't know. I'm not an engineer so I can't say.
Are you telling me you are an engineer and know they
won't work? I don't know so I'm going to wait and see. You're so certain, though, that any of those changes are doomed to fail?