http://predictionbook.com/predictions/1710
Kind of vague, but I suppose it's not too hard to do a search and note that the NYT only mentioned Intrade a few times in the 2000s and more in the 2010s.
http://predictionbook.com/predictions/1709
I have no idea how one would measure this one. I'm sure that at any high school you could find a student willing to wager with you on any damn topic you please.
http://predictionbook.com/predictions/1712
Agree with orthonormal that this is seriously over-optimistic. The only site I even use today that I did in 2000 would be Slashdot, and I haven't commented there in a dog's age.
I probably meant for claim 3 to exclude sports.
I would like to propose this as a thread for people to write in their predictions for the next year and the next decade, when practical with probabilities attached. I'll probably make some in the comments.