Re seminaries:
FWIW, and it probably isn't much, I do not think we will be able to maintain all of our current seminaries. But actually "we," that is, the ELCA, are not maintaining them now. The schools are largely on their own when it comes to financial support.
I have believed for a long time that we should have more church-wide support for seminaries, more church-wide input into curriculum required for those in the "ordination track," more spiritual formation for people in that track, and more synodical supervision of seminarians preparing for ordination.
I do not see signs that much is happening in these areas.
Seminary "tradition" and alumni loyalty is strong. Decades before the ELCA merger, there were attempts to link/merge/blend Philadelphia and Gettysburg. Didn't happen.
The merger of Central Seminary (Fremont, Nebraska), Suomi Seminary (Michigan), Chicago Seminary (Maywood) and Augustana Seminary (Rock Island), did happen, creating LSTC, because the strong, "national" LCA made it happen.