I tend to favour a moderate wide angle as my "standard" lens (35mm for 135, 55mm for 6x4.5, 65mm for 6x7). So I wouldn't be saying goodbye to that 60mm anytime soon.
I do often find my 50 too wide and would like a 60.
I like the 50mm and 80mm combination for 6x6. The 60mm is too close to the 80mm lens and it just is not worth switching to the 60mm when I can just step back and get the same thing.