First of all, ME team has made it clear several times that they are independent of DA team and their design decisions will no tbe influenced by DAI. Thus it would be misleading to say the least to use ME4 as somekind of a sign post for the next DA game.
Second, and this needs to be repeated until infinity, which fans should Bioware be listening to? If you follow these forums, it's clear that there are quite a lot of divided opinions on what would be the best direction. Thus almost always when such claims have been made, it indicates that Bioware should listen to what specific groups of fans should say, as is evident from the rest of your reply.
Whenever I see someone asking a developper to ''listen to the fans'', I indeed replace it with ''listen to me'' in my mind, and it almost always works out.
Especially for Bioware that has a widely diversed fanbase. Some people are here for the characters, others for the roleplaying/C&C, some for the pure combat andgameplay, some for the romances, some for the lore, and most players probably favor a combination of several of those factors.
Thus, asking Bioware to listen to the fans is redundant to me. They always do, else they wouldn't sell anything. They just happend listen to the people who wanted a bigger world with more content over, say, those who want a longer main story or more tactical, turn-based combat. And it looks like it's worked for them; no matter what people say about how weak 2014 was as a year, Inquisition was a success both financially and among critics and fan votes. It's thus highly likely that they stick to Inquisition's formula in several ways. Hopefully they will improve some of its failings, giving us better side-quests and a longer, more developped main story.
If one doesn't like the direction of their games? Well, not a thousand ways to go about it. Post your feedback and, if you're concerned, don't pre-order the next game (you should never pre-order games as a rule, but still). But one has to keep in mind Bioware receives feedback from thousands of sources. Not listening to one (or even a few) posters doesn,t mean they don't ''listen to the fans''. Means they don't listen to you.