I believe this is for the best. There was always something unpredictable and fascinating about being invaded/helped by a stranger in Demon's Souls. I'm glad to see Hello Games feels the same.
Not everything needs to be MP/co-op focused. I love the idea of immersing myself into this universe and randomly running into strangers. It's nice to see Hello Games still focusing on crafting a good single player experience rather than relying on everyone grouping up with their buddies