Qatar's authorities and FIFA officials are already working on few things which can used for first time because it's first world cup into the Middle East, so they want to do their best for having their desired results but still it's not easy to play and giving best results in these conditions.
Even if it is hot, it is going to be the same for everybody. So I think all the players should accept that fact and play as well as they can. The weather is going to be the same for everyone. So there is no point in complaining. The only thing that can be done is to play as well as possible.
I also agree that the Qatar government is determined to try to do everything to make sure that the environment is better for the players. Because the heat is too much we might see one or two players actually faint on the field. And that is something no hosting nation wants to see when they are hosting a big tournament like the World Cup.
Regards
Duke