I get the feeling that there's parts of the community that feel the same way. I'm hoping that the planned move to github will naturally cascade into pre-commit checks.
A big big problem is having enough hardware to have a CI throughput one or two order of magnitude what it is now. Unfortunately that's not an easy thing considering how "heavy" it is to build and test the full toolchain.
Rust uses https://github.com/rust-community/bors which maintains a linear queue of PRs which can only land after being rebased onto the commits before the PR and subsequently passing tests.
dlang uses several. One notable one is the "autotester" written by Brad Roberts. It's built to ensure that breaking the D compiler (as tested by the test suite) does not result in commits.
