Depending on price and how well they work I know I would be interested. My dream is to be able to SSH to my rigs power when away on my phone.
Personally I want a product that does it like you mentioned I really don't like building things with electricity. There are some expensive options and DIY options. But if you come up with a decent priced pre-made option that would be great for me. I have a feeling for a few others. Show us a prototype please!
Also all kinda depends on price. It's one of those things if it cost's more then a bit of downtime costs then its hard to justify.
http://www.surplusserver.com/products/Computer-Equipment/228/APC_AP9210_Master_Switch.htmltaaadaaaaaaaaa
>.>
<.<
set your mobo to power on automaticaly and log into your apc strip and power it off and on
taaadaaaaaaaaaaaaa
quoted from the manual:
-------------------------------
OUTPUT
Max. total current draw: 15 A (CSA rating)
-------------------------------
Try powering with your device 20 pieces of power hungry R9 290 and see what happens. Hehe, I guess you can't. And some people have more than 20 cards.