"is that the best advice on how to handle GPL3?! Just chill..."

Yeah, pretty much. Many of the people spouting gibberish about it couldn't have even read the license (well, if it was a thing that logic and truth was a requirement for speech - actually, of course, people can read something and claim it says the complete opposite quite easily).

The GPLv3 is only relevant in so far as it's applied to computer programs, and there ARE NO computer programs licensed under the GPLv3 yet, all existing FSF trees are under the GPLv2 and can be forked (one of the freedoms of free software) if they go GPLv3 - it's just that if you fork a tree, you bear the burden of maintenance of your fork.

Even then, the only people affected much by the GPLv3 (or v2) are the true "free-riders" who want to use GPL code without complying with the license. NOTHING in either GPL stops you independently reimplementing functionality (unlike patent law) - only if you CHOOSE to use GPL code to short-cut your development process does the license apply.