Lets say the humble bundle worked as a means to encourage a non-trivial amount of indie devs and publishers to build for or port to linux. Lets say this trend remains significant for more than a year or two. I don't for a second believe you'd see anything close to the same level of support. Right now games on linux are a commodity.
I defy someone to find another software category... hell, an individuel piece of software that has enjoyed any real, monetary support from the linux community. You don't get to argue enterprise support for distro X or open source framework Y from Z corp. Show me end users purchasing software for linux.
Don't get me wrong, I used linux as a desktop for years and still use it every day on the server. I'm a fan but the desktop community? As a developer, I wouldn't waste a second of my time building something for linux unless it was purely an open source passion project. Linux desktop users seem overwhelmingly more than happy to eschew a paid product for a free one even when the free one is absolute crap by comparison. <Insert snide comment about linux desktop users not valuing their time as evident by their use of linux as a desktop in the first place.> I hate to use the term freetard but as someone who makes money from building things, that's how I largely see the linux desktop community. To put it bluntly, there isn't much evidence that they are worth the time.