I think the (only) reason the company would cancel the show would be because they will inevitably notice a STEEP decline in social media action, especially during festivals. Nobody will want a photo at EPCOT any longer, and it’s main draw, drinking with a view, will be severely diminished. Sitting around the lagoon will be loud and unpleasant for your eyes, and those food pics aren’t going to have a good enough photo background to justify the purchase of specialty food for some festival goers (I imagine the Arts are going to be severely impacted by this).
They really have given away one of the most important elements of the show during the daytime - it is as if they have learned nothing. Rivers Of Light gave away it’s show elements too early because they lost their 100 floating lanterns, and had to make due with dodgy pacing which led to it’s demise. I can’t imagine that Harm is gonna have that many tricks.
I think that between poor guest feedback, a severe drop on social media, and bad word of mouth, Disney will have wished to have invested in some of it’s other projects.