The Rulli situation is a win-win, either earn some profit or get a good goalkeeper for cheap. Right now its looking like he will stay in Spain. Don't think hes is up to the required standard yet, I doubt he ever will be but the option is still there next summer.
Hart is going to be sold for £15-20m. That leaves Willy and Bravo. I would like Bravo to improve and show his worth, I just don't know how likely it is to happen. He is low on confidence and simply lacks the communication skills of Willy. There is still a lot of time left but as of now it is looking like Willy will keep his place. That means he'll probably be offered an extension and we maybe get £10m for Bravo. In order for Bravo to stay he'll need to make a dramatic turn around otherwise I think hes off and Willy stays. Would be very surprised to see both leave. That makes the fee for Ederson reasonable and I would be confident going into next season with him and Willy as our 2 main keepers.
Ederson is apparently on the brink of a call-up for the Brazilian national team. If we want him, we should get this deal sorted before the fee goes up even more.