My Raspberry Pi has an ARM processor, so does my iPhone. I don't think that the ARM processor line is a bad thing, but it's no intel chip. Apple had a great processor with the old Motorola Line before they switched to Intel CPU's. they did it because the Motorola processors like the G5 needed liquid cooling to work or huge air heatsinks with many fans. I worked on the G5 Mac Pros, and the iMacs of that time.
I'm sure Apple will continue to sell it's products to it's consumer base as it always has and will do well, as they know whet they're doing and who they're selling too. if you want a nice looking computer with an easy to use interface you buy a Mac. If you want to game you buy a PC tower. I do wish that Apple would make a touchscreen Mac desktop, or laptop, but I won't hold my breath, even though I do remember a third party company years ago that modified iMacs into touch screens, those were fun to work on. there's nothing wrong with the ARM processors they have great potential.