I don't think EA needed to learn any new lesson from Battlefield 4. I think reviewers did. And some have.
With regards to Inquisition, it has already been delayed. As to whether or not it will be again, any prediction that is not backed up with specific inside information from BioWare Edmonton is mere idle speculation.
Not to mention, as trends in games go the evidence cited above is cherry picking at best. An industry as broad as games, or even as narrow as "RPGs" contains within it multiple trends across both the long and short term. This is, I'll point out, also an industry where Early Access games (eg. games released for public consumption before they're done) is also a very real, observable trend we all have the opportunity to participate in. That's before we consider the myriad games reluctantly released before they're truly finished, including Dragon Age II. One could just as easily suppose that Inquisition is headed for a premature release of some kind, based on the standards of the original proposition.
As a consequence hand-wringing over how the delay of completely unrelated games from completely unrelated studios - even if they share something as nebulous and incoherently defined as a genre - relates to a potential delay of Inquisition, is simply poor logic.