A yute in the P&W band is fascinated by brass, trumpets in particular. This past weekend, I asked him why he didn't learn it.
"My parents wouldn't get me any instrument that you can't plug in. The only way I got them to buy me an acoustic guitar was by convincing them to get me an acoustic/electric."
And here I am, proud of the fact I'm the only un-mic'd instrument in this group...
Back to the topic at hand and concerns regarding learning some boring, but universal instrument, such as piano. Sometimes we have to do and learn things that may seem unreasonable and possibly pointless. However, you can look back after several years and see how it benefitted you. I think every child should go through at least a year of piano lessons. You learn music theory, proper posture, and work both hands. From there, branch out to whatever instrument strikes the child's fancy.