I'm not so sure I agree with the last two posts — my logic being that if you learn on an acoustic, then if/when you 'progress' to an electric you'll find it a damn sight easier! Also, I find that the tiny extra bit of faff involved with electrics (switching on your amp, finding a jack lead) can be a bit of a turn-off for practicing. With acoustics, you just pick them up and play!
I see the logic in this, but with any musical instrument it's 'if you progress' not 'when you progress'. Being put off the instrument as 'too hard' is entirely possible whatever instrument you attempt.
With a guitar, you not only have to contend with the difficulty of learning the instrument but you have to contend with an extra physical problem in terms of acoustics being a tad harder to fret. This could be enough to convince a newbie that it's just too hard.... A shame for someone to give up because of the instrument being an obsticle as opposed to a useable tool