So first time sharing my opinion.
To me, these disbandment rumors sound more like some wishes of a group of guys who want to see Blackpink go down. Black Label is something I could imagine but I don't see it happening. I don't know why YG would move them to the Black Label. Why should they?
The comparisons with 2NE1 are also rather inappropriate for me. Park Bom had her big drug scandal in 2014 and neither her nor 2NE1 have recovered from it. Even when their MAMA stage was amazing and many people liked it, it got much hate from the public. And when Minzy decided to leave we all should remember that she had NO solo promotions (nothing). At all. No talk show, no radio show, no solo, no shootings, no drama, NOTHING. Unlike 2NE1, Blackpink has the status of being YG's most successful group at the moment. Every member is super successful and Jisoo said she will have her solo this year. Back then 2NE1 was already losing popularity, BigBang was still YG's biggest cash cow and at the beginning it looked like IKON would follow BigBang footprints. Blackpink are at the peak of their career and I doubt YG will let them go. 2NE1 was super popular and successful but it's not comparable to Blackpink's status in YG right now.
I mean we will see but my guess is that Blackpink will renew and get better conditions. We shouldn't forget, even if they are very successful solo, their solo success is also tied to the name Blackpink.
Personally, I think they improve the contract terms and have a shorter term. Maybe only 2-3 years.