That's why I said 'at least'. It really depends on how long Deep and Awake maintain the desire to carry on with it. It's already one of the longest surviving adult games, and after another 3-4 years, it will have been going for almost a decade. I personally think they have enough potential material to keep going for longer than that. But if they lose the desire to carry on, that won't make any difference.
Which is why those of us who love and support this game, need to carry on saying positive things about it. Because that's what makes the Devs want to carry on with it. Deep has said time and again, that as long as enough people keep asking for more, he will endeavour to provide it.