Wouldn't have made a difference if you assigned that seat ago, or a week ago.
If they need that seat....they will remove you.
They will most likely give you the corporate reply of:
We will always endeavour to retain your seat selection. However, for operational reasons, we may occasionally have to re-assign seats without prior notice
It sucks to be booted out of your seat. You can try asking again when you check in / at the lounge. But there's not much you can do. Good news for you is you'll still be able to select 30F/32k with the tiny bit of "extra legroom".