Unfortunatly many Charedim will not marry Sephardim or even Dati Leumi/MO. They will only marry other charedim from their own circles
I dont think Ive ever even heard of a Yeshivish person marrying a Chassidish person
In israel you Sephardim are marrying Ashkenazim all the time and its erasing the lines between them (In the US there are alot less sephardim compared to Ashkenazim so there is pull to Ashkenazic, but only because of numbers