This whole console thing started due to Hori saying he wanted to play DQ on a big screen right?
Yes.
That and DQ being on many different platforms. I expect a 3DS SKU but what about the supposed console version.
I don't see PS3 being a valid choice in 2016 especially since I feel the main reason SE would want DQ on consoles is for as greater Western appeal. What other reason would there be?
If suddenly Square decided to not release DQXI on the 3DS I'd be really, really confused. They've been building their fanbase there carefully. I think the 3DS has got a DQ game three years in a row (Monster, VII and Monster 2 remakes in 2012, 2013 and 2014). And they all have sold quite decently.
They may take their time to relaese it, but they don't seem to rush new entries. DQIX was released on 2009 on the DS, 5 years after the system released.
Without Nintendo's advertising help I doubt the next Dragon Quest would sell well in the West.
Without Nintendo publishing it's doubtful it would even be released outside of Japan anyway.
That proves how much Square cares about making DQ relevant in the West. Well, that and DQ7 remake being MIA.
When talking about DQ we should act as if the West doesn't exists, since they don't seem to have interest in pushing the brand anywhere outside Japan. If they wanted they'd have announced DQ7 a while ago.