Station to Station

Rumors are circulating that the proposed PS5 will play every PlayStation game ever made - which means those that appeared on all it's predecessors.

Source

I have explained before that when the PS3 was released, i noticed it had no backwards compatibility - so not willing to part with my PS1 and PS2 games, I gave up on PlayStation and have since never looked back.
I mean, it was certainly a turnabout face, when the PS2 offered full PS1 backwards compatibly, right?

Since then, I have no idea about what Sony have done since in regards to backwards compatibility. Sure there are some PS1 and PS2 games available on the PSN but whilst good news for those games on there, it's no so great for the games not on there.
So to have such a turnabout face is a surprise on my end. What made Sony, known for shunning backwards comparability change their mind?

Are companies actually waking up to the dangers of poor gaming historical preservation?
Did Sony see the backwards compatibility functions on the Xbone and grow jealous?
Did Sony glance at GoG and see the success/brand-loyalty/money they were generating?
Did Sony see an opportunity arise with Nintendo's weakened position with their closure of the Wii Shopping Channel and their condemnation of ROMs?

But, as always, these are just rumours.
The real judgement comes when the PS5 shows it's face.....