IMHO, if he wants an electric, get him an electric! If the type of music that inspires him uses them, he will be more inclined to stick with it.
When I decided to start teaching myself how to wield the axe last year, many folks told me to get a decent accoustic first, then go into electric. I didn't listen, since what inspired me to play bwas the Classic Rock of the '60's to '80's, and got an Epiphone Les Paul, Crate GX-30M and a Pandora PX-4 for my first setup. I don't regret it ONE bit! Being an inveterate tinkerer, I've even learned how to do basic setups, and upgraded the pots, caps and switch on the epi. I recently got a Gibson Pete Townshend Signature SG Special, that I am in love with, to compliment my LP.
The nice thing about electrics are that they are easier to play well than accoustic, so it could keep the frustration level down.
Unless the kid has classical guitar career goals, IMHO, get him what he wants.
I bought my 10 year old a Squier mini Strat (scaled down, youth sized), and gave her my Crate amp to learn on (I bought a small Traynor tube combo). I am teaching her and she's doing well. The Squier is pretty decent, especially for the money (<$100). I did replace the machine heads ($20 from ebay) though, as they were next to useless, and had to do some minor setup (string height and intonation)adjustments. Now it plays well and definitely has that Strat "snarl" with a surprisingly accurate range of strat tones. She's got most of the "cowboy" chords down, and I'm slowly going through the scale book with her.
Sharing a love of music is a great way to inspire, as well as spend time with your kids! Nothing quite like listening to my 6 and 10 year old sing Won't Get Fooled Again in unison!
HTH!