I doubt Bioware will tell us ahead of the release of MEA. They will probably leave the door open to make a trilogy but see how well MEA sells and how Ryder is received before deciding whether to continue with it. IIRC, Hawke was originally intended to be a multi game protagonist until DA2 fallout caused the "no, DA games have new protagonists every time" line. If everyone loathes Ryder they might even dust Shepard off ala Master Chief if ME5 is made.
I would prefer a multi game protagonist (assuming I like her -- I hated Hawke) because one of the parts I enjoyed the most from ME was building up a personal history with the NPCs. Save game importing with one protagonist and crew had its flaws, but I still found it really immersive and would hate to see it go.
You hated Hawke because EA cut the writing team down to a one year turn around on the game and act 3 was written in a month. If they were given two years it would have been amazing, IMHO. ACT I of DA:I just reads like Hawke instead of cookie cutter Inquisitor, and the Corypheus reveal then makes sense and has high stakes.
The writing really isn't that bad dialogue wise the redundant use of locations is what killed it for most people.
Then EA had to give DA:I a year extension to do the race creation instead of just having Hawke...guess they should have let them write it correctly the first time, and we wouldn't have had a crap game in between the two. Inquisition was game of the Year, but the writing could have been much better, they had to write down what they had already written in advance...it's kinda obvious if you write for a living...
EA can screw up a free lunch through greed and pushing deadlines.
They have owned BioWare for 10 years now. Let's hope they get how to make money with it. It's like wine. Let it breathe. It's not two buck Chuck...that's your soccer game and Madden. Pump that crap out every year. It has a market niche, it's not an RPG with a cult following.
You bought something because it was profitable, don't kill it.