nomis5 - 11:54 am on Jun 21, 2012 (gmt 0)
If earnings are falling big time over the long term then a change of direction is required, that's clear.
What's not clear is the nature of the change. Abandon adsense and websites in general, and do something entirely different, or, change direction within the adsense world.
First of all, adsesne is not the only way of earning money fronm a website. Everyone's mileage differs but Vibrant Media has proven a good additional income for me. There are other companies out there who may suit your sites better.
If you abandon your websites entirely then what are your alternative money earning potentials? Remember, change is always scary, maybe the alternatives to adsense are not, in reality, all that scary.
I would say this, take a week off, go fishing / gardening / lounging on a beach, and forget it all. Then come back to work, place a blank piece of A4 paper in front of you, draw a line down the middle and list the possibilities for an adsense existence on the left and the non-adsense possibilities on the right.