Not the houlier than thou attitude again. It's like we've gone back in time to the Moyes era.
People wanting Van Gaal arent necessarily being short term in their view like you have assumed. Far from it, instead of holding blind hope that things will turn out fine, some of us see the mistakes Van Gaal has made in his tenure here, and also remember that he's been fired in his last two big club jobs. For all the good with Van Gaal, when things go wrong, they tend to go wrong spectacularly. 3 points of the relegation with Barca, out of the UCL places with Bayern, failure to qualify for the world cup with a star studded Dutch side. That comes along with the fallouts, media wars . There is no certainty that we'll only get the good.
A year of Van Gaal relative to 4/5 years with a managers that have far outperformed him in the last decade isnt short term thinking. Far from it. The argument has always been that he's building a great team for his successor, we are simply giving that successor a year's headstart.