This bodes well in terms of lower prices, better battery longevity, and incredible performance for the soon-coming ARM MacBooks.
On the supply side, the very high cost of Intel CPUs has been adversely constraining the pricing flexibility of Mac computers. Apple sells orders of magnitude more iOS devices, all ARM-based; if they could sharply increase the sale of Mac computers, it would also be profitable for them -- and it might unify+simplify their software development efforts.