Penalize ignoring a message from a match
One of the worst things about Mutual is matching with someone, sending that person a thoughtful message, and then getting ignored. Unfortunately, this happens far too often.
1) Each person has a queue of, say, 5 waiting messages. Each message must be either responded to or the match removed. Once the queue is full, all new matches will be hidden. If someone removes too many matches, his/her ability to swipe is temporarily revoked.
2) If someone ignores more than, say, 50% of new match messages, he/she will be forced to initiate conversations or lose the ability to see new profiles.
The danger, of course, is that the system would be easy to game. Somehow each person should be incentivized to make meaningful connections, not try to rack up matches to ignore.