From looking at Codenvy's logs, about 3,000 of our recurring users access the system using a chromebook or tablet. It's only single digit % overall, but it's a number that is larger than we would have thought it would be.

You're looking at it wrong, it's not that they're going to use a TABLET/Phone instead of, but part of the workflow. Maybe for a quick bug fix here and there. What about if that laptop you had to haul home for occasional work was just your phone that you plugged into a monitor that had secured access to your corporate VPN where you logged into your dev environment to fix a bug that's hanging up Operations from releasing a new version?

Sales and of tablets and phones are growing massively while sales of PCs are dropping... if this trend continues, wouldn't most people be developing using tablets and other touch devices?

The phone industry caught the PC industry because they were not innovating anymore, its was just about how to make more profits by reusing the same infastructure and just iterating enough so people would buy the "new things" - see Intel.

Now its only a matter of the PC industry learn with this punch in the stomach, and really innovate; once it does it; its back on track again..

Intel board copying Arduino for instance, is showing they are learning..

Also, imagine when they start to create something like Raspberry PI but with movable parts.. where people could change its small pieces with something to give it different functionality according to the pieces used... Even if the big ones from the industry do not see that, some small player will do it.. and the PC industry are restarted with a fresh cool air