To improve the car, the team
must have the cars finish races continuously.
Senna is able to do this, albeit relatively slowly in comparison to the potential of the cars ability.
Maldonado has not shown that he drives for the team, in my view. His continual recklessness comes from an immaturity, that may or may not stay with him.
He has no place in the present F1 style, that relies on point finishes to retain and draw sponsors.
He is however a spectators delight, if he not taking out your favorite driver that is.
Ardius' choice of Alguesuari is something I agree with. He knows the tracks and is fast enough, as well as being able to bring the car home for valuable tech input and points. A driver that could push Senna rather than confuse him as I believe Maldonado does.
Maldonado creates a belief in Senna's mind,(in my opinion) that all he has to do is circulate and he will finish the season in front, therefore has ends up with a seat. Not what a team needs either.
Whatever Williams do, they must make a decision, to resign or look for other driver/s soon (6-8 weeks)