no, 95% of the worlds software is not running on OSx.
that other 95% isn't just windows. and isn't just intel. (you've reversed the logic). Apple's OSx currently only accounts for ~5% of the worlds Operating system usage.
And microsoft (except for Surfaces) never were a PC manufacturer. i'm still not sure what point you're even trying to make
and no. Stand-Alone PC's are NOT dying. in fact, the PC Gaming industry alone was worth over 35 Billion dollars in 2015 and is continueing to grow.
the PC industry is not dying. what you're seeing is that the "pre-built" PC industry is slowing down and is a mature market, where margins are narrow, and volume is key. Sales have overall slowed down in the market because for most users, whats out today, si enough. But it doesn't negate that there are users who do need more, and as we've moved on Apple has provided less to these "more" people than ever before.
and yes, judging from how long it's been, Apple maybe very well planning a full blown refresh of the lineup with new designs, etc. But that doesn't negate my point about switching to ARM. unless Apple has some magical, never seen before, never leaked, and never able to be reproduced Arm based chipset that they've magically pulled out their asses without even their own licensed FAB's from knowing, Apple is not planning on making the Arm switch here
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this is delusional
idealistic dream that for many would be nice, but ultimately still just a dream. the iPad pro's are great devicves, but to think that their CPU's are even remotely full featured and capable of replacing full desktop CPU's is ignorant at best.
Also, wireless is not the best solution all the time. I sure as hell am not uploading my 4k recorded video to the cloud, just to download it to my computer again. there's a significant difference between 20mbps upstream to cloud (because lets face it, noto everyone is or has access to synchronous gigabit) and directly wired to your target. do you think a photographer, or video editor with gigabytes of recorded materials / media is going to wait all day for their material to be uploaded to the cloud before working on?
do you think corporations who required 100% up time connectivity, with 100% stable network access are going to rely on wireless? its an ideological pipe dream.