I'm excited about Homebrew potentially coming to Linux. When I first started using OS X more regularly, I was surprised by how better an experience OS X + Homebrew is compared to Ubuntu/Debian repositories + PPAs/third-party repositories.
I don't use Linux myself, but am curious as to why this has been so heavily downvoted.
For most (all? Slackware...) Linux distributions, there is ONE package manager: for Debian/Ubuntu it's APT, for Arch it's Pacman, for RedHat & friends it's RPM, etc. There is exactly one, because all the files which aren't user data or configuration are owned by some package or other. It's all well and good when there's a clear need for this on OSX, and so Homebrew must keep up to date with the official software management and keep itself contained, not breaking anything. Having a second package manager on Linux, which doesn't treat Linux as the main target platform, seems both pointless and asking for trouble.
Alternatively, you could be harsh and figure that the downvoters were saying, "No, you don't prefer Homebrew. You prefer your distribution's package manager, and thou shalt use it correctly."