" why should hardcore gamers playing World of Warcraft/Lord of the Rings Online/etc. care? Because we're having children of our own and we want to share our passion for gaming with them."

Indeed. My daughter has quickly moved from WebKinz to Pokemon which, while maybe not a HUGE jump, tells me that it won't be long before she's looking at the MMOs I play and will want one of her own. At 7 years old, however, she's still not at the age where she can get into some of the existing offerings. I'd be more then happy to see MMOs designed for the younger set, even if they are offered by Disney.