Well, my thinking here is that increasing available time by reducing the number of hours people have to work to live is going to be a net benefit to individuals like you’ve mentioned in your first paragraph too. People are more likely to go out and do things and find each other if the majority of their energy and waking lives aren’t tied up with work.
It might make some difference – however, if a person's dating expectations are fundamentally out of sync with what's realistically available to them, having more time to spend on meeting new people might not change the ultimate outcome. What we don't know, is what's the proportion of "probably would have found partner if they'd had more time to look for one" versus "unlikely to have found anybody that would satisfy them no matter how much time they had to look". If it is mostly the former, your proposals might make a big difference; if it is mostly the latter, your proposals are unlikely to change much
