I feel that the viral licensing clauses in GPL v3 will ultimately hinder the further development of software.
While Apple (as an example) were using GPL v2 licensed code, they were actively contributing patches and changes back to the relevant projects. This was good, it meant that we had professional developers who were paid to work on these projects and the changes they made were contributed back upstream.
Now that no corporation can touch any GPL v3 licensed code, we now have fragmentation and less developers working on open source code bases.
Apple, for example, have had to implement their own SMB stack as smbx, instead of using Samba. For a number of years, SMB compatibility and functionality took a huge step backwards on OS X, all because the Samba project started to use GPL v3. This ended up with developers who would have been working on patches and changes for Samba, instead working on their own closed-source implementation that, quite frankly, was nowhere near as good or as mature as Samba. The end result of this was that Apple's customers suffered with a sub par product and the Samba project suffered with fewer people contributing to it.
Who then benefits from GPL v3?