The AFC and CAF have hosted plenty of tournaments in hot countries over the years. Personally I've never understood the big deal about the playing conditions. As long as they are not actually oppressive to the population in general (e.g. spectators). Surely part of the game is to adjust your playing style to the conditions, within reason. If it is hot, you keep the ball more and don't waste energy chasing lost causes as you would do in November in the mud. If it is dry and hard ground, long balls will bounce through more easily.
Of course, you could also adjust the rules e.g. water breaks every 15 mins, extra sub, or reduce the length of the game down to 70 minutes for example.
Yep, although critics will say that those countries in Asia and Africa are 'used to it', and it's not the same as inviting countries from Northern Europe, kind of like a reverse Super Bowl argument. And completely agree with the 'adapting your game' part, of course most World Cups are usually held in optimum conditions (or close to it), but there will always be surprises and part of football is to adapt, like that Switzerland v Turkey match at Euro 2008.
Unfortunately the 'spectators' part will probably be a lightning rod for controversy even with the air-conditioned stadiums
, you just know that there's going to be a fan or few who suffers from heatstroke and it'll be Qatar's fault despite the fan receiving numerous warnings about what to do for their own safety. I'm basically picturing this
In fairness I played in 25-degree heat the other week and felt a little uncomfortable by the end, although that might have just been the cheap artificial turf trapping more heat close to the pitch, plus playing for something like half-hour to an hour with no water break, and not particularly wanting to put myself under too much strain for the sake of a pick-up game. I'm sure if there was an important match, even with a higher temperature, I'd push myself more and be around people who make sure I'm doing the right things... like staying hydrated.
And I think FIFA already have a water break rule if the temperature's above a certain level but it's around halfway through each half, though common sense says that can easily be added to if the situation calls for it. The introduction of video referees might allow a few more informal water breaks as well...