Um, didn't last season show that Massa can't be replaced at short notice?
Badoer - not a real replacement
Fisi - not a real replacement
Had they been able to find someone even nearly in the same ballpark as Massa talent-wise, they might have been able to snag a few more constructors points and stay ahead of McLaren.
First off, the Massa incident meant that Ferrari had to find someone to replace him within the space of 1 week. The obvious choice was too look at their test driver - Badoer. In his prime Badoer was terrible. In his twilight, he was even worse.
They then looked towards Fisichella, who in his prime wasn't bad. But in his twilight was at best, decent. It didnt help that he arrived in a team/car using KERS, from a team which never used KERS. This meant that he was struggling from the word go.
When I stated that Massa could be replaced, I meant that he could be replaced during the course of a Winter (off-season). I'm pretty sure if Ferrari wanted to replace Massa in 2010/2011, they could have their pick of any number of decent No.2 drivers: Webber, (maybe Button, depending on how he fits in at McLaren in 2010), Kubica, Trulli, Glock or Rosberg. Ferrari would also have the option of looking to other forumlae to see if there are any up and coming drivers. Remember, the role of the No.2 is to give backup to the team-leader and pick up points, behind the team-leader, assisting with the team to win the Constructors title. The role of No.2 is driver is NOT to compete right at the front and take points away from the team-leader.
All the above drivers who I have mentioned would make decent No.2 drivers who are not in the twilight of their careers and who will have had adequate testing time to acquaint themselves with the 2011 car. Massa can be replaced.
Now lets look at replacing Alonso...what are the options: Hamilton, Vettel and Button (depending on how he performs in 2010). Anybody else would be a step down. How easy would it be to ask Hamilton/Vettel to leave their respective teams and join Ferrari in 2011? Not easy; and perhaps virtually impossible (given that RedBull and McLaren look to have produced decent cars in 2010 and would have very little reason to leave their current team for Ferrari).