no thunderbolt means apple is saying, "Hey professionals, don't buy this laptop."
Or "hey professionals, forget thunderbolt 3, get USB stuff"
The usual professional Apple customers don't use a MBA as their main machine. That's what the MBP is for. The MBA is a consumer laptop. That being said, forgoing the TB port would really set it appart in the whole Apple computer ecosystem. But then they're not afraid of that kind of moves.
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I don't know what they will do, but all I really want is a retina screen and better battery life (than my mid-2012 one, the 2013 and 2014 are fine). Smaller bezels to make it prettier (and fit a 12" screen without changing the footprint - I'd rather a 11" with the current footprint than a 12" in a bigger casing).
Everything else can stay the same as far as I'm concerned, as long as there is no performance degradation. They can even remove all the ports and the trackpad click.
The only thing that would make me rethink upgrading would be a bigger size and a heavier machine. But I don't think that will happen.