The problem with your proposal is a MacBook costs a lot of money. A lot, especially compared with an MBA. Not having something like the MBA (reasonable connectivity, performance and price while still very light) would destroy apple's education market.
Regarding a skylake MacBook, it should have been released months ago. Of course it's a silent update because at this point it's embarrassing. Wall Street is right. Apple is an iPhone company.
I can see them continuing to churn out a modestly updated MBA with a poor screen solely for the education market.
If you look at the iMac and Mini, it seems like Apple has no problem putting out a very poorly spec'd product at the bottom of the price point to get people 'in the door'
Though in fairness, if it's mostly for educational needs - does it need the latest/greatest hardware?
The daughter graduates from HS this year. Perfect world I'd love to get her a retina screen MBA or a multi-port MB. I fully expect to get neither and have to decide what side of the compromise fence I'll land on.