The Columbo's and Bonnano's have been rumoured to merge since the 80's.

Doubtful it will happen. Neither family was historically very large and despite the Massino devastation the family seems to have whethered the onslaught. The Columbo's meanwhile have hung in even under Persico and when he passes there may be a newer generation who will go back to a more quiet way of doing business. Castelle/Casteluci brothers, Uvino, young guys who may steer the family better post Persico.

So who knows? But IMO if a merger was going to happen it would've post Massino.