I'd have thought the reasons behind the strong belief why Torres will be off in the Summer would be so apparent to any follower of the PL that stating them would be almost patronizing...
Torres is a member of the elusive "genuine World Class striker" club. That is to say, it is universally accepted that in his given position, when in form, there are none better. He's a star member of a World Cup winning national squad, a European Cup winning national side.
Now lets look at the situation of Liverpool -
1. No CL league football again
2. No European football at all increasingly likely
3. Not contending for PL title again
4. Manager who bought Torres has gone
5. Manager who succeeded said manager is of a lower caliber and fails miserably.
6. Torres interest on pitch is palpably low - to the point of it actually being uncomfortable to watch at times.
7. Liverpool, despite needing to spend in other areas (wide), spend over 20m on a CF in January, two weeks after their manager is sacked.