Interesting Psak: dating and marrying people from other eidot and groups

Some shadchanim sent a question to Rav Yitzchak Zilbershtein, rav of Ramat Elchonon neighborhood in Bnei Braq, about mixing and matching.
The question posed was that they think if people would not be strict to only marry within their own sect and group, it might solve the growing issue of older singles. For example, there are older Chassidishe men who have not yet found their match, and their are older Litvish or Sefardic women also not yet having found their match. If they could be set up to date each other, many of them might find their match and get ...