I think many normal people use their PC at home much, much longer for "casual use" than for work. So, I would reverse your assessment, the PC will keep its nich

I think many normal people use their PC at home much, much longer for "casual use" than for work. So, I would reverse your assessment, the PC will keep its niche for the odd non-casual use at home but tablets will absolutely dominate when it comes to what people use home computers for the most, casual things.