All great points. Us current pandorians are fine using a 2005 era desktop UI (we bought it, after all). But perhaps something with a more modern UI and integrated android app compatibility (as Sailfish seems to promise) would be an attractive option to new buyers?Mer is then the 'distro' built out of this. And Sailfish OS is what JollaMobile is releasing as their version of this.
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Getting Tizen as a base (or Mer as a kind of distro) would be pretty sweet, but there would be quite some effort to build a 'functional' system out of that for the Pandora.
And yeah, it's mostly touch oriented with the UI relying heavily on Qt and html5, which is cute (get it?) on its own, but I don't think there are many useful things for us Pandorians in that regard.
Anything that takes us away from the "desktop" linux experience that many of us know and love might prove harmful to appealing to a core customer base, so I'm wary of it, despite being curious about the new possibilities.
As you point out, Mer+Tizen may need considerable work, especially if one goal is to support older linux apps not designed for QT.