Sam said it was the game he was most proud of, of course he would want to believe it would return one day.
I'd say their options are limited to Kickstarter though. It's been 5 years, no other publisher has stepped up to the plate for a sequel....never say never, but it's clear there's not much interest from publishers. Probably because Remedy won't surrender the IP.
MS....well, it's clear they are interested in owning the IP and they wanted something more action gamey then psychological horrory. I don't think they're interested.