Many old members of adsense told me that they have made huge money from adsense early on but this is gradually decrease.

Now I want to know what will be the future of adsense. As yahoo in beta mode and Microsoft is also ready to get into this fight.

So far Adsense had monopoly and they have really enjoyed it but now I think Yahoo and MSN should come up and give option to publisher as competition is better for service.

What do you think about this ?