Idol X from Alcatel Is Less Than 7mm Thick
It's not thin enough
Also - if an iPod with a full hard-drive inside it can be 10.5mm thick, which is 3.5mm off, then 7mm is way, way too thick.
Thickness is the most irrelevant dimension
Even if the battery life is good it would always be better if that same tech was built into a bigger battery.
Of course when you are at a trade show a phone with an impossibly thin profile will be considered far more flashy and gather more attention than one actually far more suitable for the real world.