I will say, in the spirit of the OP, I have seen a seeming shift in the conversation regarding 5e over the past...year, perhaps two years at most.
That is, up until a year or two ago, it was strange to go more than a few months without someone gushing over 5e, showering it with praise and adulation. I personally found such threads quite tedious, and thus stayed far away. But I noticed their presence. Obviously such threads were very common when 5e first came out so people were all jumping on the bandwagon as it were, but even after they died down, they remained pretty steady for quite a while. As stated, if more than a couple months went by without a thread like that, it was a surprise.
And then, they seemed to slow and stop. Obviously it's hard to notice an absence, but as I said, over the past year or two it seems like people have shifted their attitude about 5e. It's no longer all sunshine and rainbows and puppies for everyone and eternal sugar-frosted happiness for all. There's a certain....I wouldn't call it "disillusionment," that's much too strong, but perhaps "chagrin"? Maybe it would be better to say the honeymoon has well and truly worn off, and the day-to-day foibles and the chafe of certain restrictions has begun to show. I don't think it's at all a coincidence that things like Level Up and other, similar projects (as well as rumors about a "50th anniversary" update etc., which we know have since been soft-confirmed) started gaining traction around this time.
5e's golden dawn has faded. Plenty of people still obviously love it, not at all trying to imply otherwise. But I'm not seeing that outrightly effusive "ermahGERD I just HAVE to talk about how AWESOME this is" stance anymore. Some folks are criticizing changes in art direction (y'know, that tedious brouhaha we had recently.) Some are criticizing the mechanics. Some, as noted, chafe under the restrictions of the rules that exist, wanting more options or more customization or more depth, etc.
Whether 5e is the "silver age" of D&D or not, I don't know. I don't personally think the "gold/silver/bronze/dark/etc." age terminology is particularly effective, but who knows? But I think we have hit the silver age of 5e individually. The gold hour has faded to the silver light of day, and some folks have noticed a bit of tarnish here and there.