On the contrary games are better off when they follow their own vision, rather than trying to force-feed us popular gameplay trends that may or may not fit in with the games' strong points, for nothing other than advertizing. That's how we got CoD clones, it's why DA:I took inspiration from Skyrim and other open world games.
ME:A isn't doing exploration because Witcher 3 and Bethesda games were popular (ok, it might be part of the reason), they're doing it because it was a promising element from ME1 that they never got the chance to revamp and make it good. Technically ME did exploration before exploration was the popular trend for video games. That's why I have more hope for ME:A even with Inquisition turning out like it did.
Now is Bioware's chance to take the promising elements of ME1 that were implemented poorly, and were then dropped without being given a second chance, and bring them back better than ever. They don't have to focus nearly as much attention to the combat now.