I'm from the Netherlands. I live in Sweden. In both countries the banks have been able to set up a shared service to make digital payments easy for consumers, despite them being competitors[0][1]. In the Netherlands we also have one national transport chip-card used by all public transport providers[2].
Based on that I would say that what this may need is just the right amount of (and type of) government regulation to force the different competitors to play nice enough to create a better end-product for consumers and to compete healthily with each other. I won't pretend to know what that regulation would look like though.
The problem is with the exclusive deals, with the IP holders ruining the space for everyone in an attempt to maximize short-term revenue (it will kill their long-term revenue), perhaps thinking this is battle royale, and they obviously will be a platform that wins in the end.
I don't think it's the Highlander end-game they are envisioning, rather there seems to be a drive towards a new (imagined) equilibrium with specific streaming services servicing specific demographics — like Disney is aiming straight for the 'wholesome and family-friendly'-niche.
Of course we all lose as consumers (until you hoist the Jolly Roger in despair).
You know that hip, edgy Vice News, the one with stories about doing drugs in war torn Africa? Yeah Disney owns like ~16-20% of that.
Disney is EVERYWHERE; be afraid of The Mouse.
All the edgier material goes on Hulu apparently.
The user would go to a central place where all streaming options are available to be browsed and watched. The point of differentiation would be at payment, as the cost to the user, for whatever they just selected, would go to those who own the rights. No walled gardens, everyone wins. The user pays one monthly price, or within a fixed range. How to figure that all out, well, that's where complexities arise.
My personal soltuion, thus far, is to pay for the service I'm using the most (currently, MhZ Choice), then find other solutions for that which I don't pay for.