We certainly wouldn't have to watch out for the sort of change that could radically affect the way our pages are arranged.
One such change could be just around the corner.
When Google announced that it was releasing video ads on its AdSense network, they indicated that something big could be about to happen. Video ads that look like television commercials could well change many of the strategies that we currently use to maximize our revenues.
In case you haven't seen them, the video ads are available in three formats: medium rectangle (300 x 250), large rectangle (336 x 280) and square (250 x 250). They begin with a static image and require the user to press the Play button to run the video. You can either get paid by impression or per click - but that's per click on the link or on the screen when the ad is running, not on the Play button.
To get one of those ads, you need to be receiving at least one of those formats and have opted in to receive graphic ads.
At the moment, Google's video ad inventory is pretty small, but it's only going to get bigger. It's just so easy these days to create and edit a short ad, that there's no reason why even a small company can't create its own television-style commercial and send it out across the Web.
What are these ads going to do for your AdSense revenues?
It's too early to tell exactly. I think it's pretty likely though that they're going to prove to be popular and grow in popularity as advertisers figure out what works best.
For now though, I think that publishers need to be keeping an eye on them. We need to be aware of where to put them and what to do get people clicking on them. We could find that we need a bunch of additional strategies pretty soon.
