See this is where I think it gets muddled, because you aren't really asking them to do this. The theme parks are always going to be supported by the multitudes that go to them regardless of whether SW or Avatar or HP or any other IP is represented. The way to boost your attendance is to get the people who may NOT be going to your park to come and check out the cool new thing, or the people to stay a day longer, or to buy a park hopper instead of a regular ticket. This is what HP did for Universal. Universal's park isn't supported by HP fans. It's boosted by the influx of HP fans. There is the normal flow, plus a percent more. Then building the two lands a part and connecting them with their version of a hopper? Brilliant.
This is what you are asking SW fans to do. Will there be a huge crush? Sure, but over the long term, the 50 year+ lifespan of the land being built, what you are really asking is for SW fans to make an extra visit every year or 3, stay an extra day and so on. They don't have to support it 365 days a year. The regular crowds do that. They just need to plus the crowds to make it worthwhile. Now the SW hotel? That is a different animal. There I agree with you. But if you are talking a 100 room boutique, you aren't asking that many people either. Can it be sustained for 10 or 20+ years? That will be the question.