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I fail to see any negative aspects of having multiple compiler implementations around.

IMHO that's the main reason why C became so popular, compilers are free to explore into different directions, language extensions that have proven their worth will eventually be picked up by other implementations, and sometimes even make it into the standard without being butchered too much by the committee agreement process.

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I'm confused, I thought that there already were 3 around? Or at least 2? gcc plus the one from dlang?

the 3rd, LDC, uses LLVM as backend. Both all share the same frontend. https://dlang.org/download.html

open-D is not a 4th implementation it's a fork.

There also SDC which is an experimental D compiler not using DMD code. I don't know how complete it is but it is actively updated.

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