People just start praising things years later from release. At release DA2 was universally panned around here with some people enjoying characters and combat but mostly everyone hated it. They take that feedback and design a much bigger game in scope with beautiful lands and lots to explore and now people are like "They should make a linear game like DA2". People just don't know what they want and when something is new it's kind of cool to join in with the bitching about it. I'm sure in a couple of years people will be comparing the newest games to DAI and outright praising it. DA2 is a heavily flawed game that did decent character development. The combat was more dynamic than Origins but suffered endless spawns of enemies that appear from nowhere and a really poor tactical camera that was tacked on to shut up PC users.
Is it wrong? You rate thing in perspective. When compared to Origins DA2 was a let down despite being a good game. Good as in funny, enjoyable, not as in majestic. DAI was a let down compared DAO, DA2 and developers promises, despite being a much better game than his predecessors. So yeah, it is possible that a future game will make people love Inquisition, it can always be worse.
In fact the next game will have LOTS of haters, not because people hate everything but because Bioware created at least 7 different fan bases:
1 - Fans of DAO
2 - Fans of DA2
3 - Fans of DAI
4 - Fans of DAO/2
5 - Fans of DAO/I
6 - Fans of DA2/I
7 - Fans of DAO/2/I
So, the chances of letting down one of these fan bases is close to 100%. Letting down 4 is very high. If they do the right-wrong job they can even get the 7 fan bases to hate them... LOL... even so, since they are a company as long as they have a big enough 8th fan base created they are ok and can keep up with the franchise. I think we shouldn't oversimplify analyzes, it is important to know that people play for different reasons and one change can make a beloved game become a hated one, it doesnt even need to be a next installment, a DLC, or even a patch can do that...
I love the crafting system in DAI, let's suppose I play the game for this sole reason (it is not)... if they change or remove it in the next game I could be disappointed to the point I don't want to play the game anymore. If exploration is my drug unless they make the next game as big as Inquisition (or bigger) I wil be frustrated. So that's how it works. I don't blame anyone, reason for liking and disliking a game are very personal and sometimes very specific and I think it is easy for people who just "sit there and play the game" to judge those who have different levels of involvement and different focus and approaches on the game.
The game is what it is and people will love or hate it and that's ok, everything in between is ok too. And Bioware will take a stance on how to deal with their fans and that's it.