Well, let's say this is the world view of all companies about open-source software. Then what happens. If people "tend to not give crap" about licenses, all the nice guarantees of GPL etc also disappear.
GPL was made in response to restrictive commercial licensing. Yes is uses the same legal document (a license): but is made in response!
So is propriety seizes to exist, then it's not a problem GPL also seizes to exist.
Also: it's quite obvious to me that IP-law nowadays too much. It may have been a good idea at first, but now it's a monster (and people seem to die because of it: Aaron Swartz and Suchir Balaji come to mind).