What ever happens you can be sure that advertising on the internet will just grow and grow. now it might be through adsense or other similar networks but in some form. As more and more people use the internet, advertisers see the web as a way of brining attention to their products and services, hence the ever increasing expenditure on web advertsing against much slower rate of growth on other forms such as print, TV, radio. Create a good site/s and you will make money.
Do not worry if adsense is not there, even then if you have sufficient traffic to your site, you would manage to get advertisers on your own and probably you would earn even more compared to your adsense revenue, coz. you get the whole 100% percent of what advertisers would pay directly in your pocket