Well I'm guessing the majority of consumers couldn't care less about the Mac Pro so what's your point? Clearly people are buying Amazon Echos. It would be stupid for Apple to not compete in this market. If the sound quality of the speaker is good I'll probably get one.
Knowing Apple and the avenue they have taken with the stellar stereo speakers on the iPhone 7 and quad speakers on the Pro iPads, I am most certain they will use a high quality build with the speakers/drivers into their version of this. I have been interested in a smart speaker for while, I'm glad I waited it out to see what they have to offer.