Ok, so just had another thought on this concept, in part based on this recent story about ASUS being the leader in non-Apple Tablet shipments.
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1. So according to that, ASUS's profit margin is very small on the tablet itself, but high on the keyboard dock.
2. Padfone concept has limitation of being phone specific, and thus carrier specific.
So my thought to ASUS is, forget about making a phone, forget about even making a full tablet with onboard SOC. Instead, make a tablet dock that's basically a screen/extra battery/additional I/O connectors, and make it as an accessory to several/most of the top phone models. To keep development costs down, keep it basically the same, but with different models that vary only in their location of HDMI/USB connectors to fit different phones, IE bottom for EVO, etc, side for Droid X etc. Would just have to move wiring around a little, and change the shape of the dock to mate with the phone, and with otherwise standard components, you can then have an accessory that you market to all of those different phone model owners. Your target audience is then expanded to everyone who has a high end smartphone and wants a tablet = PROFIT!
Secondarily, make that tablet dock mate with your transformer keyboard dock, thus second high profit margin accessory with a large target audience = PROFIT!
Software integration could be an issue that I don't know enough about, but I would think it could be manageable.
Ah, just found this, someone's already thinking it... Could even be a bigger target audience than Android, make PadFone/Transformer accessories that can target iPhone/Android/Windows Phone, and you've got a huge market.
http://www.itproportal.com/2011/05/...dfone-tablet-iphone-5-computex/#ixzz1O0WJlA75