Just posted this in one of the articles in regarding to Sony being interested in anything besides Days Gone.
"Honestly, I totally get this. I really think Higher ups were just not interested in the story/characters/world of Days Gone and I can't blame them... you can take the same gameplay and put it in another universe with even more of a distinct spin.
I'm very happy they're working on a new IP"
Not every game needs to be a franchise. DG probably went on to sell pretty well in a year where there was no other major PS exclusive but I think ultimately its universe doesn't really stand next to Ratchet, Horizon, GOT, TLOU, Uncharted... there isn't a mascot or iconography to bring forward.
Seeing as there's so many stories and worlds for Sony to try their hand at, I totally get wanting to leave this fairly vanilla tale behind in favour for a riskier, more unique endeavour. Maybe one that uses a similar gameplay blueprint although I'm hoping not.