Who says we should sell Suarez? The thing is Suarez is just one example, there has been plenty of players gone and plenty will eventually leave if our current situation remains. It is all a cause and effect relationship and about time, it is admitted instead of being surprised and begging for players to stay.
On Suarez, the club should not sell him as he is a key player. But it is also important to remember in modern football, players have greater power, even more than club itself at times. If the players wants to leave, there is nothing we can do as "eventually" he will leave. Might not be this window but the next. And if anything, seeing Suarez fickle behavior + unnecessary controversies/interviews, there is a growing number of LFC fans who want him out. Maybe not to Arsenal, but as mentioned above, the player has the power