I think the only truly unfixable problem here is "Our founding team doesn't care anymore". Plenty of companies have made successful pivots, even later stage. I

I think the only truly unfixable problem here is "Our founding team doesn't care anymore". Plenty of companies have made successful pivots, even later stage. It gets harder and harder the larger you grow of course, but it's always possible. Most startup deaths come from a lack of motivation. Everything else is a side effect of that.