Good move. Both of those are very good, and they may very well 'dry up' at some point. I think Exton is in serious trouble.
I don't think that the fact that the finale to Honeck's M3 is 25 minutes long is what makes it good. What makes it 'work' is the fact that the PSO has strong enough strings and brass to fully sustain those 25 minutes. It helps that they're playing in a relatively 'smallish' hall, so it never sounds small or thin.