Smells a bit like a troll thread by the OP, but eh, I've seen great conversations come out of far less intelligent ideas. This is a good conversation to have.
I apologize for the length in advance.

I enjoyed the some of the exploration in DA:I, and I am overall a fan of the game. There was a few areas that really ticked me off that are relevant to this thread. The problem for me was threefold:
1) The Requistion Table was a badly implemented idea. I can see what they were trying to go with, but with a few exceptions, had
zero impact on the main story line. It felt like busy work. The various little sidequests were okay by me, but that table can go die in a fire.
2) The War Table felt like the "reward" for all of that busy work, and it left a poor taste in my mouth. Don't get me wrong; I'm a lore nerd. Pretty much any game series I'm into (not an Elder Scrolls fan, but that's just me,) I'll dig into the lore. I like having lore in my games, but I felt like the War Table was a way to pad the game out.
3) The combination of the two left a feeling like it was a way to get more zones. Whether it be a MMO or a single player game, adding more stuff for the sake of it is not usually a great idea. I know there was a lot of lore, but it was overshadowed greatly by the WT and RT. That led to some major tedium.
Even more than the zone tables, watching the quests my IQ couldn't do because she was out collecting herbs and turning in excess drops took away from my enjoyment of the game. On my first IQ at least; I skipped those RT quests on my second IQ.
I personally don't think that some of the exploration elements in DA:I had very much to do with the BW fans. I think that, for one, Skyrim was hugely sucessful and it makes sense that RPGs would want to emulate that. As someone pointed out earlier, it's like the CoD for RPGs and that fits quite well.
However, something that can be easy to forget is that the BW developers are gamers, and play a lot of these games as well. Some of them have talked about being fans of the game. Sure, I'm betting money and success of TES played a factor, without a doubt in my mind. On the other hand, I think it was a case of gamers trying to incorporate elements they liked from a game they played into their own game. I commend the effort, and I think their heart was in the right place.
Frankly though, it didn't work out as well as it should have. Yeah yeah, I know, understatement for some, but that was one of my biggest beefs about the game. It's part of the reason why I never got into the TES series as a whole. For my taste, there was too much exploration and sidequests left the game's main plot crashing to a halt. I know that isn't true for everyone, it's just my perspective. That being said, exploration is TES strongest suit, and nothing wrong with loving it. My dad has been a TES fan since the first game in 1994. Still, that has never been a strong suit of BioWare's.
If we want to get into BW's history in general, and if they are thinking more "open-world/huge sandbox" for ME:A they should take another look at the BG games. That hit the sweet spot for me in terms of exploration (including the risk of sudden death) and lore expansion. Well, except for gathering my party before I ventured forth. BG isn't my favorite series by BioWare, but I always thought they did exploration "right" for my taste. That's just my two cents.
Sorry about the wall of text there. It is something I've been thinking about quite a bit lately.
TL;DR: Usually I never do these, but this is a huge post. In my opinion, I don't want them be like Skyrim, or DA:I. I thought that ME2 and ME3 were too limited. They should be more like the BG series in terms of exploration, and using zones to expand the lore. As was said before, less zones, and give the player a more tightly focused narrative.
When I hear "bigger than Skyrim," I roll my eyes. I don't give a crap who's bigger, it's how you use it that counts.