2020
global shipments of Macs was
~22.5 million.
Starting price of top 20% of laptops & desktops start at $999, the starting price of base model MBA & Mac mini when you include quality display/keyboard/mouse.
I would not be surprised that Apple gains 50% of the top 20% desktop/laptop market by 2023. I'd be happy when they replicate the iPad's success by taking over ~80% of the top 20% desktop/laptop market by 2025.
Mac desktop/laptop taking 50% of the
whole global desktop/laptop market regardless of price point is
fanciful.
Apple's only interested in the top 20% for resource & legal reasons.