i never said it was "impossible" that blizzard did some nonsensical and utterly bullshit thing to just retcon their game and add the same class again under another name with HOTS skills, this is you assuming that.
What i said is: it is highly
unlikely that they do that, because
warriors are blademasters and already share theme and fantasy(because again, same class), and, is way more
likely, aka more possible, to simple give the arms spec more blademaster-ish features or even add a 4th spec to warriors.