I've heard this about not playing other sports but never to only play half of one in HSHow many things can you really be great at, and get school work done. Sure there are some. I would prefer that my daughter NEVER had to pick up a bat! Many times we get so caught up in getting kids to do every thing that what winds up happining is....mediocraty at best.
Be great at both, the no time for both thing is used to much. There is always time. Your husband is wrong.