No the Linux kernel didn't move to gpl3 for this reason.
Maybe, but even if they wanted to, it would be almost impossible. In Linux, the license of contributed code says "GPLv2", period. Not "GPLv2 or higher" like a lot of other projects do. If you are not the rights holder, you can't "re-license" a piece of GPLv2 code as GPLv3 as you could with for example a BSD license piece of code. Simply because the GPLV2 is too restrictive. So that would mean getting in touch with all current and past right holders / contributors (and maybe even people who inherited the rights of contributed code if the contributor passed away?) and get permission to re-license to GPLv3.
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Maybe, but even if they wanted to, it would be almost impossible. In Linux, the license of contributed code says "GPLv2", period. Not "GPLv2 or higher" like a lot of other projects do. If you are not the rights holder, you can't "re-license" a piece of GPLv2 code as GPLv3 as you could with for example a BSD license piece of code. Simply because the GPLV2 is too restrictive. So that would mean getting in touch with all current and past right holders / contributors (and maybe even people who inherited the rights of contributed code if the contributor passed away?) and get permission to re-license to GPLv3.