I've probably said this before but despite everything, I've always believed in Strauss' ability to be a Test-match player of calibre. I don't believe his bad run started until 2006, in India, and while it's been familiar stories throughout - weakness against spin and inability to keep the ball down when driving through the off on the front-foot - they're not things I believe are insoluble.
It depends, though, on him, and those around him, realising there are technical problems there, something that simply doesn't seem to have been done so far. He needs to have worked, very hard, on driving properly - both making sure to leave lots early in his innings, and when he does get the drive out to play it with a high elbow rather than snatching at it as he has done so often the last 2 years.
If he hasn't done this, he'll always struggle against a seam-attack that manages to do the not-particularly-difficult matter of pitching the ball up, away from the pads, to him.