Will Flash sites die in 2020?

I was reading article about Flash dying in 2020 and I wanted to know what exactly will happen to Flash based websites? Will they simply just not work anymore. My work uploads video ads to TV stations and one of the stations is Comcast and their portal is Flash based, so Im curious if it will just stop working. I have to imagine they have people on it but I have doubts. We had a automated uploading software developed to automatically login and fill out form inf and upload videos and it works fine the other stations but not Comcast because it is using Flash. When we talked them about it thy didnt seem to care. So Im curious if there is incentive for them to redo their portal without Flash so that we can automate it.