All very nice speculations but none of them are scriptural, there is no scripture saying to no longer use Jehovah's name quite the contrary, And so Jehovah stands as God's name until such a scripture happens. Any speculation on Jesus name or actions somehow replacing this is just reading into the scriptures your own viewpoint, explanations and justification.
I've never said that people should not use "Jehovah" or "Yahweh." I use it occasionally myself. Having said that, we have to accept the fact that the Divine Name was not emphasized in the New Testament, by either Jesus or his followers.
Even in the New World Translation's translation of the Greek Scriptures the name "Jehovah" is not emphasized. For example, as I've already mentioned, Jesus never utters "Jehovah" in any of his prayers. In fact, how many times does Jesus say "Jehovah" when he's not quoting the Old Testament? I did a search once and came up with only 3 possible places in the NWT where Jesus says "Jehovah" apart from OT quotations. The rest of the time Jesus uses "Father" and "God" when talking about his Father.
How many times does the name "Jehovah" appear in the book of Philippians in the New World Translation? Or in First Timothy? Zero. In several other books of the NT in the NWT, the name "Jehovah" appears on a scale much less than it does in many OT books.
Can you imagine a Watchtower study article that did not contain the name "Jehovah"? Or, someone praying at a Kingdom Hall and not saying "Jehovah"? Or, someone who mainly only used the name "Jehovah" when they were quoting from the Old Testament, but not in their everyday speech?