With Didier Drogba leaving, there was doubt as to who the new striker would be for the Blues. Romelu Lukaku doesn't seem ready, and Daniel Sturridge took some steps backward at the end of last year. Rather than spend a ton of money on a new striker, Roman Abramovich should just rely on Torres.
Chelsea have already supposedly agreed to spend nearly £80 million for Eden Hazard, Hulk and Marko Marin. They still need to fill the right-back position, and the team could use some reinforcements in the defensive midfield.
With three options up top, the club has no reason to spend £50 million on Radamel Falcao or another desperate move (someone like Karim Benzema or Edinson Cavani).
Neither of those players are leaving their club, and Chelsea aren't going to make a move for them. Without a player of that caliber, Chelsea have no reason to bring someone in.
When push comes to shove, there isn't a better option.
Chelsea are hoping to bring in a few more players this summer (see above link), and the club's total spending could run up to around £125 million. Obviously, Abramovich and the club have money to spend, but don't expect the total spending to eclipse much more than the £125 million mark.
If the Blues feel the need to bring in another striker for £35-50 million, they probably won't be able to fill other needs (unless they sell a handful of players for more than they're worth). It's not the smartest financial decision, and Chelsea don't need to make those tough decisions.
All the team needs to do is keep Torres as the striker.
Abramovich supported Torres when he was down, and the Spaniard seems very grateful. The two are on the same page: Torres needs to be Chelsea's starting striker next season.
Chelsea need to stick with Torres because the Blues have bigger needs than the striker position. The cost of another world-class striker wouldn't be worth it. And Abramovich already supports Torres so the rest of the team, assuming Torres comes into camp in form, should follow suit.
Drogba leaving Chelsea creates a problem for the club. Luckily, Torres is ready to solve it.