Neither Safari nor Firefox are going to implement them.
For something to become a standard that something needs two independent implementations. Before that it's just some browser's prototyping stage, no matter how many times Chrome will tell you otherwise.
According to chromestatus, WebMIDI now has positive position from Mozilla and negative position from Safari: https://chromestatus.com/feature/4923613069180928
Just three years ago Firefox's position was also largely negative due to unresolved security issues: https://github.com/mozilla/standards-positions/issues/58 It's possible those issues are now resolved, that's why it's making its way into Firefox. This means that Safari's stance may also change.
Same goes for other hardware APIs: from the point of view of both Safari and Firefox those specs have security and privacy holes the size of Jupiter. Not to mention that the quality of some of these so-called specs is very low. If/When these issues are resolved, we may see them implemented in these browsers, too.