I know I already weighed in, but I'm in the car driving home from DW, so I have nothing better to do
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The land is exquisite just the way it is. No one should assume every young child doesn't enjoy it. I met a 5yo Star Wars fan who was stoked he got to ride RotR twice because of rider swap. Just as with adults, SWGE will resonate with some young kids and others just won't like it. If a child (or adult, for that matter) has a sense of adventure, SWGE will draw them in, regardless of how much they like Star Wars.
I have gone to DW many times with my niece and nephew, and now my 15mo DD is coming home from her first trip. Something that my niece and nephew had to learn, and my daughter will too, is that a family vacation is not just about them. There will be parts that some members enjoy more than others, but we do everything. There's always something they can find to like about a land or a park; shopping, theming, games, entertainment, etc.