Well, enicalyth, I just passed 12,000 hours in Command on the 'ole three engine Lockheed, and from where I sit in the LH seat, it sure works for me.
Far too old to change now.
Now I thought that I was one of the high time guys, but personally know of a few with over 15,000 hours in type.
The SV birds have been bought, with the intension of flying a few in scheduled/charter ops, so I guess there is indeed life left in Lockheed land.
Maybe some new blood on the horizon will keep it going just a bit longer than anticipated.