“But new wine must be put into fresh wineskins.”
Here is the solution, to keep the new wine to new wineskins, and not try to mix it with the old. Everything must be seen anew. Thus must they rejoice in the bridegroom, and not fast over Him, and they must receive His new message (which will be declared shortly), putting the old (Judaism) aside.
The idea is carried further in John 2:1-11 where the new wine symbolises the glories of the Messianic age. The time has come for the fulfilment of Isaiah 25:6.