No, I can't agree, sorry. I'm older than you and I've watched the science/math curriculum change from the time I went to school to when my kids went. In about 20 years science and math have become way more demanding, earlier. Logically you'd think if THAT was all that was needed, America's scores would have been going up. Meanwhile it's the art, music, phys. ed. departments that are losing funding and compared to other countries America lags. It can't be a coincidence.
Not to mention the fact that if you cut arts and music, there's a huge percentage of children whose only exposure to art will be graffiti and the only music they'll ever hear is rap. Is THAT a healthy direction for the future? Kids who can't appreciate a Van Gogh or a symphony by Mozart?
Finally, not all brains work the same. A child who has no gift for math may be an artistic or musical genius, but if all they find is failure because they can't "get" math how will they ever find success if nothing else is offered (particularly if they come from a poor family that can't afford to send them for private music lessons or provide them with art supplies?)