BP was the undisputed 1st place but they're not very far from the other GGs in their gen. With proper promos/ mediaplay on YG's level, now SM has proven they can make another BP (not literally but i'm talking about success only). Aespa with 1 year can sell 1m, can you imagine what they will become in their 4-5th year? People can be staying in denial now but it's happening: a girl group who can surpass BP has arrived.
On a side note, BTS aren't safe either. If their sales keep declining and group activities keep being reduced when new BGs keep growing and, in 2-3 years, we'll have a new face of BGs. Be prepared Armys