Shield is transitioning, not declining.
When they debuted, the whole idea was they were an unstoppable unit. They couldn't lose a match and beat ever team of superstars thrown at them for about eight months. To say they were incredibly over is an understatement.
Then they won championships and things changed. They all have gold now and because they were on fire like they were for all those months, the belts are now enhanced. Yeah they lost a six man tag, but all three were champions when it happened. The focus of the Shield is now on the belts and the people as individuals, not the unit as a whole. This had to happen eventually because you can only be a three man unit for so long. Shield isn't in decline. They're evolving.
I'm not sure I can buy into all this
There's something about this point that's amiss
That the Shield are transitioning, I'll buy
But in return, they're becoming "just guys"
Having the titles slots them on the card
Now being the main focus is quite hard
Look at Wade Barrett, now fighting the Miz
We've seen his career sputter and fizz.
Becoming a champ slots you on the show.
That's not always good; look at Cesaro.
Transitioning? Yes, that's perfectly fine
But in trasition, they've hit a decline