Definitely worth a try. Worst case scenario, you try it and it doesn't work out, in which case, it's easy enough to go back to your old routine.

This isn't a kiddo, but if you want some real world experience, a friend of mine with straight hair recently went mod-CG. She has fine hair that's easily weighed down and had been using shampoo /conditioner, terry cloth toweling, air drying till damp, then blow drying the rest of the way with a round brush (otherwise some ends would flip out). It never looked frizzy or dry, but she was considering splurging on Wen because it was starting to feel sorta rough, like she was doing a number on it with the daily shampoo and blow drying.

I suggested she try Ren cleansing conditioner or perhaps Renpure's Brazilian Keratin Straightening line. She ended up grabbing both of the Ren varieties, plus the Brazilian Keratin shampoo /condish, and the first try with the Ren left her with gunky feeling roots but better feeling hair. After explaining it's the scrub, not the suds that clean the scalp, the gunky feeling disappeared when she paid more attention to a good scalp scrub and a really thorough rinse. Her hair felt better and better until a week or so in, when she hit a bit of protein overload, so she's incorporated Suave Naturals Everlasting Sunshine and just tried Garnier's new Hydra Recharge conditioner. Now she rotates moisture /protein depending on how her hair feels when she wets it.

She's been mod-CG for a couple months now, and other than the products she uses, her routine is the same as it was before. She says her hair feels much better now though, and she gets more compliments on it as well.
CG since 11/2011
2c /3a F /Mii, low porosity

Winter Products /Routine:
Clarifying: Herbal Essences Tealightfully Clean
Low Poo: Renpure Luxurious Argan Oil
Co-washes: Suave Naturals Tropical Coconut or Daily Clarifying
RO:
Tresemme Expert Selection Perfectly (un)Done, Cure Care, Suave Tropical Coconut or Daily Clarifying
LI (if needed):
Tresemme Perfectly (un)Done, Renpure Brazilian Keratin Straightening (old formula), Cure Care
Stylers: HETT, AIF
PT: IAGirl's as needed