, I think the two are directly linked. We win on Sunday and it gives us a boost, a surge of self-confidence and belief to go on to secure 4th, taking advantage of a couple of London clubs in freefall. Lose, and we'll be full of doubt and regret and eke out the rest of a miserable season scraping 6th or 7th.
I think that is the correct answer. This is a ludicrously false dichotomy. We do not need to choose and, in fact, winning this makes us more likely to finish 4th.
I will go further than that, though.
Winning Saturday makes this next generation more likely to go on and win other things. Regardless of what anyone thinks of Houllier, Rafa etc, the victory in Istanbul started in Cardiff with Gerrard, Carragher et al winning their first trophy, on pens, against lower division opposition. Without that it is reasonable to think we may not have had the season we had in 2000-01, not developed the crucial trophy winning and subsequent European trophy winning experience and that generation would've been less well equipped to go all the way to the victory in Istanbul.
So beating Cardiff is a massive first trophy for the returning King, and for the squad of the next 5 years plus; Suarez, Carroll, Henderson, Adam, Skrtel, Agger, Lucas (I assume he'll get a medal) etc have yet to win club trophies. It can bring know how and hunger for more. And there is no reason to think it will detract from the FA cup run or the push for 4th.