Pretty sure atleast an apology from official pakistan gov is required before amicable relationship - considering most Bangladeshi people remembers 1971. (unless the gov already did this which I am unware off).Bangladesh is in jubilation as Sheikh Hasina gets removed from power. A Big SETBACK for India as they have lost a close ally in Sheikh Hasina who has also fled to India.
A great opportunity for Pakistan to reset its relations with Bangladesh in an amicable manner as the people of both countries already have great mutual respect for each other. Also there is an eye open lesson for non political forces in Pakistan who think the people can't bring about any change through protests. A moment of agony for PTI supporters too as they missed the great opportunity to let their demand meets after a great rallying of people post 9th May which could have fetched early elections for them and also head started a probe into regime change operation.
Also with the arrival of pro China governments all around India, there is a great opportunity for Pakistan to revive SAARC and raise issue like Kashmir, water management issues and other issues which could eventually bring peace in South Asia.