I have a trip in October. I'm definitely not cancelling. I didn't care much either way about whether it would be open. Disney is a massive theme park that is always crowded. Everyone wants the park to have "more", but then when they offer more, people wish that "more" was just a little later so they don't have to deal with it. There's no winning.
I understand being frustrated and not wanting the crowds, but at the same time, I don't blame Disney one bit for this. I appreciate that they are a business and that they are also offering more to their customers. I'm excited for all the upcoming attractions at WDW, not just SWGE.