What you really need is a great conductor, the orchestra only has to be reasonably good.
But the great ones have all passed on.
Not all of them have.
James Levine, Leonard Slatkin, Klaus Tennstedt, Christoph von Dohnanyi, Kurt Masur, Seiji Ozawa, and many others are still stalking conductors podiums. Personally, I’ve worked with a few of the above mentioned, and AFAIC they’re every bit the titans Solti, Bernstein, Böhm, and HVK were.