I just reread your original post, you already have the 300 F4 L IS so
I would keep the 300 and add a 1.4 ext.
The 70-200 is a keeper as well.
I would not recommend the 100-400, you would really be stepping down in image quality in comparison to the 300 f4.
I have had the 100-400 for many years, (use it for convience for Middle School sports and wildlife when I don't want to bring out the 400 2.
I have not expereinced the dust sucking effect that I keep hearing about.
The 100 macro is an excellent lens and very sharp.
If money was not an issue buy the new 16-35 that is just coming out.
16-35 2.8 (Version 2)
add 24-70 2.8
100 2.8
70-200 f4 maybe upgrade to the 70-200 2.8 L IS
300f4 maybe upgrade to the 2.8
I just bring whatever I need for a particular assignment and leave the rest at home.
Nothing wrong with having "extra" tools in the shed!
AHAB