I actually think they will fall apart . Too many children then there's a power vacuum with in fighting they all end up hating each other and a bunch of different factions spread out across all her territory . Probably even lose some to other hunky etc....
Don't think a scenario of Totland surviving as "Yonko" territory will occur if BM goes down... But I thought at one point that Pudding had an evil plot of her own to take over the family and she'd do it through the use of memory manipulation.