There is one other crucial element that you have to remember. Sony and Microsoft
would have to claim responsibility for the security, of the accounts, personal
data, and network. For this you would realistically have to ask yourself, what
is in it for them, "longterm". What will it cost vs profit them "longterm".
With mods and potential modded operational files there is always the threat of breach, and theft.
Maybe they may be including a virtual machine and environment embedded on a ROM, go full
circle and go old school lowtech in order to run mods. Or marry streaming and a VM machine
to create an insulated environment making closed servers this time, to insulate the games, the
OS, and data from external access and manipulation. They may make them backward compatible.
But following the 31 year history, of closed and tightly controlled process, those seem like some long
odds.
Remember; at the rate they advance technology, there are an untold number advancing untechnology
to match. As an example, they are using Arduino devices embedded with simple ai to almost perfectly
spoof present and advancing security techniques at a hardware level. Yes, there are some other games
that have mods that they allow, but as a corporation, their main thought would be on the level of
control, and the investment in time and finance necessary to adapt.
Personally I am anxious to see, the outcome. I have followed technology, from the 286 and Dos to now.
So, fingers crossed, maybe they will change their working model, this time.