I can't ever see Universal catering explicitly towards kids... but a few family dark rides in each park (3 or 4) wouldn't hurt. Just enough that little kids and those who can't handle thrill rides can have enough to enjoy a full day at the parks. Universal should always cater primarily to the older demos... it works best for them. Universal could use some mid-level coasters IMO (not kiddie, but family like Big Thunder, Matterhorn, Everest and Space).
Epcot, Hollywood Studios and Animal Kingdom are 90% targeted towards adults if you think about it. The Seas with Nemo and Friends, Gran Fiesta Tour, Maelstrom, Spaceship Earth, Great Movie Ride, Toy Story Midway Mania, Disney Junior Live on Stage, Voyage of the Little Mermaid, MuppetVision, Kilimanjaro Safari, It's Tough to Be a Bug, Triceratop Spin, Finding Nemo - The Musical, Festival of the Lion King... 14 attractions over 3 parks that a little kid might enjoy (I'd say Maelstrom, SSE and Great Movie Ride wouldn't necessarily appeal to them specifically so 11 attractions over 3 parks that directly target kids under 10 - not counting M&Gs or play areas. Living With the Land isn't really something kids will be itching to go on, while Imagination and Energy need help
Universal can match that with both of theirs currently, a few family attractions for each park would put them over the top.