One less place to get knowledge and news from. This forum is full of knowledgeable people and it's always good to learn from them. Most questions asked would get a detailed explanation within 1 hour. I personally use this forum because of the active community here.
But people/the community would just move on to the next best thing if it ever stopped 'existing'.
Are you kidding? Bitcoin would not be as popular as it was today. Mainly bitcointalk has been a platform where everybody into bitcoin gathers to start a discussion or topic whether it is simply for trolling or otherwise. I imagine all the people would be somewhere else scattered into different forums and the community would not be as it was today.
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As above of there wasn't bitcointalk there would be another forum. Bitcointalk was obviously just the first, though I think the way it is run has made it so that it is still the best.