"...emerging forms of ... mostly married couples...."

Yes, quite right, especially when considering effective and influential lay groups like Sant Egidio Community, Communion and Liberation, Focolare Movement, Neo-catechumenate, and even Opus Dei. Very effective lay people. And the whole Charismatic Renewal Movement. These are huge and the future. However, alongside these mega-lay groups there will always be Christians called to -- who feel called to service-- in more traditional orders -- Jesuits, Franciscans, Carmelites, Trappists, etc. The Dominicans at Providence College, Benedictines at St. John's and elsewhere and Holy Cross Community at Notre Dame all seem to be doing well, too.  All these communities seem to have special communal gifts that still attract a minority of young lay people. I think together -- the super-mega and mini --  all "look forward," believing the vision of their founders' and leaders' spiritual revolution or renewal was meant to last more than a fortnight.