Blue tooth car kits are available for these head units plug and play in 10 minutes and ncdc 2015 has phone capability anyway as do other head units.
Fair point re iPod and cdr's, although an fm modulator gets round both those to a point.
But what would annoy me is head unit integration with the car display would be lost, to my knowledge there isn't a head unit on the market capable of talking to the screen as well, but then I have a colour info display fitted in my car.... 8-)....and then there is getting the steering wheel controls working and all that faf.
Plus I'm surprised navigation is not mentioned, so I guess I'm wondering why an upgrade within the factory range would not integrate better?
But each to their own, your car and all that, but personally, above all I could not bare to sit in the car and look at some tin can with led's dancing away stuffed in the dash like an after thought with no consideration to the rest of the car systems, it will de value the car.
Yes factory head units have their limitations, but the cost of rectifying (other than financial) is also a consideration IMO.
But each to their own as they say... :-? :-/