Linux is the only other viable platform to run the development tools on... other than Apple.
That's one of the reasons it should be given higher priority.
Plus you need to remember the devs are only thinking of having one other non os to export to.
Bringing in Linux's user base might actually help to get some of the other formats ported.
Is that the topic of this thread though? The poll is asking what platform we'd most like to see our games run on. The simple answer to that from a serious developer's point of view is easily: Consoles.
If the poll read: which platforms would you also like to be able to run Construct from to develop games, then Linux and Mac OS systems would easily be the best answer. But unless I misinterpreted the poll, that's not what is being asked in this thread.
So essentially: If this engine's aim is to become a viable tool for serious Indie game developers interested in creating video games for a living - then console porting is an important feature to add.
On the other hand, if the engine is only aiming to cater to a handful of people who create games as a hobby and past-time, and would like to see their games run on their OS of choice as well as Windows, then Mac and Linux support could be the answer.
So it entirely depends on the goals of the engine and its creators. If console porting doesn't get provided in the next release, then developers like myself can easily look to other engines like Torque. Construct seems to be a great engine that's easy to pick up and more than capable of making great Indie games, so I'm very interested in seeing which way the engine will be heading in the future.