Do you need the f2.8?
The only point where f2.8 is actually needed (I find at least) is for dark interiors and astro. Personally, I have a 17-35mm but rarely use it. I can shoot all day on the 24-105.
There is an f4 wide angle on the way which will be cheaper but it may be a while.
You could sell the 70-200 and buy the 15-35 f2.8, then if you find you miss having a 70-200, you could buy the new RF70-200 f4 IS, which will be cheaper and lighter.
But since you already have 24-105 and 100-500 covered, you'd probably be ok without the 70-200, unless you do event/wedding photography.