It would be massively stupid to sack Rafa now, I wouldn't rule out him resigning but we are two wins from the CL last sixteen, in the Carling Cup QF and unbeaten in the league.
Surely even G & H wouldn't be stupid enough to sack a manager in those circumstances, even if we lose to Porto? The fans would turn on them, they need to sack him when we are in dire straits (Xmas?)
While Rafa should maybe keep his comments in house, he clearly isn't getting anywhere with the owners and you can bet fans will blame him if we don't sign anyone in January so maybe having it out publically is his way of making sure he isn't blamed while hoping to get what he wants