SONY will remove the fat PS3's feature OtherOS with the new 3.21 firmware update which will arrive 1. April. I think everyone should know why this happened, so far. But let's think about what may happen.
It won't be legal to force the user to remove a feature (OtherOS) which was shipped originally with the PS3. So the update will be optional and PSN support should still work, even if you do not update.
It depends how they removed the OtherOS. At the moment the PS3 system reads a flag which decides if OtherOS is available or not. If this flag is killed now, it may be the easiest way to re-enable Linux support by resetting the flag to a 3.20 one. But if they remove the function to even read the flag it may become a bit more complicate.
I wonder how long it takes till it's analyzed, too bad my PS3 got a YLOD atm But I'm sure the community will get an answer soon.