Disney parks have historically been a blend of original concept rides and rides driven by intellectual property. Since The Wizarding World of Harry Potter the shift has been towards intellectual property drive attractions. When Harry Potter first opened, we as a fan community looked at the franchises that could potentially compete with it. The list at the time was short: Star Wars and Cars. Frozen has been added to that list.
Frozen is an incredibly popular, and incredibly profitable franchise. In today's world of entertainment, something that successful gets a sequel, and a theme park attraction. When either of those things are rushed it can only be perceived as a cash grab. We've been told back in September of last year by
@Lee that the budget for the entire makeover (meet and greet and ride) is $75 million (
link). This is the least they can do, and there is very little chance the attraction can be anything other than an operational nightmare. If it's a good ride (and I have no reason to think it won't be), the capacity will be insufficient. If it's a bad ride, then the capacity may not be an issue, but we'd be looking at a step backwards and a thematic break.
While some people have a level of Frozen fatigue, it's not going away. Disney seemingly didn't want to do what they did with Little Mermaid and wait 20 years, but with Little Mermaid, they did exactly what they should do with Frozen. They built a dedicated space to it with an attraction that can satisfy the demand. At the very least, Frozen deserved that.