It’s doable I guess, with the smaller footprint being able to fit on mobile devices, maybe it’s only a matter of time before they stack up many and add active cooling too boot (is one running theory).
At the same time, 12 cores in 2010 are nowhere near as powerful and efficient as 12 today... even with the crazy stagnation that happened since ~2015 with Intel.
I don’t know exactly what you are doing that requires such a heavy multithreaded approach, I know 3D renderers and some phases for compiling code can eat as many cores as they are given for example, but for 99% of users 12 core is already above and beyond.
Ah even today the core count for many things is more important than the speed of those cores. And there is a strong case for coming out with something like 16 cores as the base, application developers would know the 'worst' ARM Mac has a load of grunt.