I would question the logic of this. Don't imagine any other leading clubs wouldnt aggressive pursue their preferred choice.
If klopp is our number one, why not go for him? Depending on the success or failure of Dortmund either party may not want him to join in 3 years.
Football is all about now, clearly highlighted by the instant gratification culture highlighted in these forums.
I don't see van gaal as anything other then settling for mediocrity. He is being linked with spurs, hardly inspiring. People might say he has more success then DM but he doesn't represent anything other then a stopgap.
Personally I would prefer if the club is going to scrap their DM strategy, that they would spend millions overhauling the entire structure of the club. Have a structure that makes a mangers role purely to coach.