Apple just announced that Big Sur macOS will fully support the Arm-based PC in 2020, will ship a new high-end x86 PC in 2020. It indicated that the full migration to Big Sur and the Arm-based PC would be complete in 2021.

Will x86 become obsolete?

Conclusion. The x86 world is on the verge of losing the performance crown on all market segments. This will happen by Apple's hand on the PC (desktop, laptop) market. ... Arguably, within the next 5-10 years, the x86 architecture will go obsolete.

Is ARM actually better than x86?

Still, ARM processors are much less powerful than the x86. Summary: ARM chips are designed for low power draw, flexibility, low cost and low heat with good performance. M1 is not a CPU. It is a whole system of multiple chips put into one large silicon package.