While the Main Street Electrical Parade is coming to an end, I haven't heard anything that suggests the Electrical Water Pageant is ending.
https://disneyworld.disney.go.com/entertainment/magic-kingdom/electrical-water-pageant/
There are rumors that Disney's Paint the Night Parade will be moving from
Disneyland to the Magic Kingdom in Florida, which has a lot of people really excited. (Being from California, I'm kind of sad to see it go.) But it is just a rumor...
https://disneyland.disney.go.com/entertainment/disneyland/paint-the-night-parade/
I will assume that there will be no announcement until closer to the MSEP's ending, rather than have this news steal MSEP's spotlight right now.
Whatever happens, have a really great trip with your kid!