I've never bought Apple products and never will; I see them as over priced, form over function, at least in the Macbooks and iPhones. The phones are a classic illustration, 20% of smartphone sales, 83% of smartphone profits, very pretty though they may be.
But this is about Macbooks and Surfacebooks. To be a Macbook "killer", the Surfacebook would have to win over the Apple faithful - I really don't see there is enough in it to do that and would they be prepared to swap OS-X for Windows 10? I can't imagine so, Apple's record on the stability, consistency and security of OS-X far outweighs that of Windows.
In fact, I don't really see who the Surfacebook is aimed at, C-level executives, perhaps? As James Kendrick said in the ZDnet article, ITS price is its own killer - $1500 to nearly $3000 for the top configuration is hardly bargain territory. Too expensive for most consumers and probably not robust enough for general business and costing way more than current business laptops from Lenovo, HP and Dell, which are more robust to live up to everyday business use. Drop the price to $1000 to $2000 and that could change the picture.
As always, your mileage may vary!