Aren't most use-cases covered already ?
I've been using Evince for years now. Haven't had a PDF it couldn't read in the last 3 years or so.
The last couple of months I've even had pdf.js in Firefox handle all the PDF's I view when surfing the web. For such a new project, I've had very little which it couldn't handle almost perfectly.
So the only use case that remains is PDF-forms. Where you get a PDF which has a enbedded form.
Something which I've not encountered on my home-desktop machine ever so I don't have Adobe Reader installed.
So how many users of Adobe Reader on Linux could there be ?
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