I, for one, would like some of these micro-optimizations to make their way into the mainstream frameworks ; I don't see my.js getting big in the current state of things but merged into jQuery, it could really help us all :)
MICRO-optimizations? Check some perfs: http://jsperf.com/my-js-perf-tests! There is still much to do for my.js to become mainstream. I may write a plugin for jQuery but for the moment I want to let my.js grow and stay independent. I think that my.js bring new concepts on the table that can't integrate in the main other frameworks without changing their core.