I believe that we should give a shit, and it does matter. The "balkanization" of open-source licensing into more restrictive versions is ultimately going to adversely impact all of us.
And, if Matt had not chosen to be an asshole, would this issue have gotten the prominence that it has got?
Also, WPE could easily have taken the wind out of Matt's sails by declaring their (direct or indirect) commercial support for WordPress.org while reducing to pay money to Automattic. As far as I know, they have chosen to not do so.
For all I know, Matt may lose the battle; but, open source would lose the war if companies and individuals continue to use the kind of arguments that WPE and it's defenders are making - that, they are legally not obligated to care two bits about the open source software on which their entire businesses are built, leave apart what is moral.