With the ratings the show's been getting this past season, I doubt they'd go for a spin-off.
They can, if they actually have a budget, if they didn't why give a plothole and an ending that seemed that the journey would continue?! It doesn't make sense to actually end it like that? It looks like they are trying to TEASE it, it's obvious.
That article does NOT imply any Revenge spin off is in the works. The writer simply says she would like to see it happen !!
That's why the question mark, sis. It's 50% percent we would get a spin-off, those plotholes and the blank ending is an indication of it. If they really did want to get a full-ending they would have made an entirely different story, but they didn't.
I don't think Nolan can function well on his own. In the show, there was always someone anchored to him that made his subplot more interesting(Emily & Louise). Not really sure how he'd work fronting his own show.