I used to shoot with the f/2.8 trinity 17-200mm, then f/5.6 out to 400mm with a TC or two. Then I'd have f/1.4 primes for special shots.
With the advent in IS, relatively clean shots at high ISO, AF that doesn't need big apertures, and viewfinders that don't need big apertures for brightness, now I think we can move to an f/4 trinity. 14-35/4, 24-105/4, and 100-500/4.5-7.1 in three lenses with no TC seems like a general improvement: lighter, cheaper, longer rand wide to narrow, perhaps a bit less lens-changing. (Really, f/2.8 even when you got it in focus was not that deep of focus, so I have lots of suboptimal photos thanks to that.) Then we can increase the primes a half-stop or more: 35/1.2, 50/1.2, 85/1.2, 135/1.4. I expect a 24/1.2 as well. So when you want bokeh and to separate out your subject from the background, you can do moreso now with the bigger primes. When that's not your goal, you still have more convenient shooting with the f/4.
But to the extent you found 70mm f/2.8 to be bokeh-ish, that's due to a 25mm aperture. 100mm at f/4 is actually a 26.5mm aperture, and the background is yet more magnified so it's easier to slightly change angles and get a background you want. So even though the f-stop is 4 not 2.8, the bokeh is the same or better. Likewise 500mm at f/7.1 is a 70.5mm aperture, very similar to a 200mm at 2.8, 280mm at f/4, or 400mm at f/5.6. So you still have the bokeh power (or more) of the f/2.8 trinity with this new trinity.