the monsters because after Gaga is done with mainstream pop she'll become a "serious" and respected musician. She won't be on Adele's level but she will be respected like Adele
A 3 decades old base still capable of making their base young by recruiting teenagers and made the band be like "The crowds are just as young as in the 80s!". Iron Maiden experienced that in the 00s and brought back their 1984-1985 World Slavery Tour in 2008 for all those young fans who weren't born on the 80s.
Translated to pop girls would be like Katy in mid 2030s seeing a new generation Kats forcing her to bring back PWT.