Maybe it's time to rethink the plagiarism taboo. Just like you can use someone else's computer code (with appropriate attribution), why not be able to use someone else's language? If someone wrote something really well, what's the point in rewriting it–probably less well–just for the sake of rewriting it? Would anyone rewrite a super efficient algorithm just for the sake of saying "I wrote it myself"? All that you need is a good mechanism for attribution, like quotes and links and stuff, you know, like all that stuff we already use in writing. In fact, I would argue that attribution is far more transparent in writing than in computer code, because typically only the programmer sees the code, not the end user. If I run a program, I typically am not looking at the source code, so I don't really know who did what, even if the README file gives credit to other code sources.
One might object to copy-and-paste writing becoming a mish-mash of ill-fitting pieces. First off, this is just bad writing, just as code that just jams together different pieces can be a mess, and will typically require one to code stuff to make things flow together well. But in a world where writing demands are growing daily (certainly the case for me), maybe it's time to consider text-reuse as a good practice, or at least not necessarily a bad one.