sorry to break it to you, but that's not how it goes anymore. The audience doesn't rate who they boo/cheer for by their character. They go by work rate and if you look at AJ Styles' heel run for example, he got a pop wherever he went, simply because people don't care about him being a bad guy anymore, they just wanna see AJ wrestle. We live in an era where booing a good heel isn't the thing to do anymore. If people enjoy a certain heel run, they'll cheer it no matter what.
You are praising this era as a sign of the end of this face-heel thing but it's nothing compared to what pro wrestling looked like in the late 90s when it comes to faces and heels, it was more extreme than today
We had in the late 90s a babyface Stone Cold who showed everybody the middle finger, used a chair and other foreign objects in his matches and gave everybody, face-heel-man-woman a Stunner.
Another babyface The Rock verbally humiliated other babyfaces, commentators and backstage interviewers.
Sting was a babyface who came down from the rafters and attacked even babyfaces and used a baseball bat like a typical 80s heel.
nWo Wolfpac was a stable that was against nWo but at the same time acted like heels, a tweener stable.
At the same time you had heels like nWo that started this "cool heels" thing. The Outsiders were cheered whenever they appeared and Scott Hall even humiliated the WCW with his survey every week "who came to see WCW and who came to see the nWo" while Eric Bischoff a member of a heel stable told the fans that he loves them instead of the typical "I am bad and you fans suck".
Scott Steiner was a heel the whole time in WCW since joining the nWo yet the fans loved the way he acted. When Ric Flair was a heel the fans still respected him by chanting Wooo! whenever somebody did the chop, same with his Horsemen during the nWo era, McMichael was a typical heel and Benoit worked very stiff but they were cheered because they were Horsemen.
I can name you numerous other examples like heel Jericho debut in WWE, the ECW wrestlers who got cheered for doing violent stuff, Corporate Champion The Rock, Eddie Guerrero's reason why he formed the Latino World Order, heel X-Pac return to WWE in 1998 and many many more.
If in the late 90s the days of faces and heels didn't came to the end then it surely will not be in 2017 or 2018 and to claim that is just a joke to defend the failure of top babyface Roman Reigns.
here's the thing about that.. you were a kid, so obviously you fall more into the whole good vs bad thing. I think everyone of us loved a good babyface and hated a good heel as a kid. But you gotta realize that the age WWE's average viewers these days isn't 28 anymore. It's 54. Not as many kids watch the product as people may think, therefor they don't have to have this big babyface fighting every bad guy, which would never work for them anyways because any babyface that gets a huge push will get demolished by the crowd anyways. Cena got it, Reigns got it, anyone else would have got it.
LOL I was 17 in 1999 and even if I was a baby back then there were still plenty of adults around who maybe thought a heel wrestler is cool but they never had the feeling the days of heels and faces are over because they respected the story those wrestlers told us.
Here is a perfect example
The Undertaker was around that time already a 9 year veteran in WWE so he was already respected. He was cheered a year before that promo and he would get cheered again 1 year after this promo but during that promo he was interrupted by Austin chants. most fans loved the Ministry Taker and respected the wrestler but this was a story told in the ring. Austin acted heelish during his WWE career but despite that everybody know he became a heel at WrestleMania X-Seven, same with The Rock, when you aske the fans when The Rock turned heel everybody would say shortly before No Way Out 2003 when he became Hollywood Rock.