I mean we can't really say she's on a decline if it's only one tour date. If Britney had two consecutive less than stellar grossing numbers then we'll talk. You Beyonce stans should know that.
Let's put it this way:
Circus Tour = 130 M
Femme Fatale Tour = 70 M
Next Tour = ??
If Brit's next tour grosses lower than FFT then yes her tour gross is declining.
Right now, her tour gross
declined but it's not
yet declining. We need 2 consecutive low grosses to consider it declining.
Beyonce's singles:
Sweet Dreams = 10
The other next three singles of I Am SF failed to crack top 50
Every 4 single failed to crack top 10
Now we have 6 or 7 Beyonce singles flopping now that is
declining
And about album sales, all suffers from
declining album sales.
Declined and declining = learn the difference