Im not going to read the thread, as I don't have time.
And I could of course be wrong.
But not as far as I can see.
Macbook - so light in every respect, it can't really be compared to an AIR, the current offerings anyway.
AIR - Not sure what will happen. I can't see why it wouldn't stay. Id have an air any day, but would never want a macbook.
PRO - For work purposes, for many, it is immensely more powerful than an AIR. Again, the two are so different I can't see the lines being merged.
To merge product lines, apple would need to conclude that there are not 3 types of consumer, but only two.
The only reason the air and pro would merge, is if apple decided to pull OUT of the pro market, catering for professionals who would go nuts trying to do any really demanding work on an underpowered machine.
I just cannot see apple merging the air and the pro in the near future. One is twice the machine (or more) that the other is.
If I haven't convinced you with the comments above, then just look at the obvious: Compare an entry level AIR to a top spec PRO. They have no similarities.
Retailers aim to supply as few machines as possible to as many different types of buyer as possible. AIR and PRO are just two different, to merge them entirely... unless apple pulls out of the PRO market.
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I think the iPad Pro will replace the MacBook eventually and you'll have a merger of two operating systems. iOS and Macos hybrid. The keyboard add on is needed if your at a desk. I think you'll also see facial recognition with touchid and eye tracking when your reading a document. I think the new iPhone 7 will have eye tracking so it will automatically scroll for you while reading, that would be nice.
This could happen one day. I'll wager the MBP will be around for a good while yet, but the iPad pro and the macbook possibly merging one day, it could happen.