Why the Macbook and not something else? Because the hardware and software will work together to offer superior battery life and UX. The build quality will allow it to function without defect for many years to come. It will be completely devoid of bloatware and statistically more resilient to malware threats. The redesigned keyboard and trackpad will remain best in class. The purchasing and support experience will be in a league of its own.
All of these little intangibles will come together in a way that no Windows vendor has been able to emulate to date and will qualify the product as a “reinvention” in mainstream consciousness.