I still disagree.
You would be giving the side more ability to score goals. We already have a superb defence and to be honest, its hard to improve that defence, you would have to spend stupid money and i'd rather the stupid money be spent on a position that is in desperate need.
It would be stupid to think that Carragher and Hyypia will need no solid cover through out the season.
Joaquin is a good player but I don't agree with your comment "if we don't Joaquin we will never close the gap between Chelsea" or something along those lines. If we don't sign Joaquin which we will not (price is way too high and our interest could spark an interest from the likes of Madrid who can easily pay more money than we can) we can sign another player. Joaquin isn't the only good player on the planet.
Secondly if you think that all problems will be solved if we signed Joaquin then you must be having a laugh. It would solve the problem for the right wing but not for the left wing [I don't see Riise or Zenden as pernament solutions to that position], nor would it solve the problem of having good cover for our CB's.
I also am not too confident in Warnock, I just don't think he will be good enough to make an impact.