If you only use monopod in landscape orientation or shoot with long teles, then you can have a monopod that is suitable for video (they don't have flip head as no video is done in portrait!). Do not even think about the cheap photo monopod for recording motion. I would also like to see someone spend a day walking everywhere with monopod, taking camera on and off and still getting a bit blurry shots. Only in sports they are very handy.
I only shoot in landscape to be honest, it's just my style, and if i'm shooting portrait it's usually for a specific purpose for layout in a magazine etc (i.e. a person giving a speech) and I do those with the 70-200 and that has a lens foot so can shoot in either orientation
I was going to get the manfrotto monopod with the foldout feet and the fluid pan at the base, or the neotec monopod which has a button to adjust the height super easily (just push up or pull down)- but all monopods seem extremely bulky, my tripod (feissol 3441t) is 1.1kg and is less than 50cm when folded up, by comparison monopods seem huge!
it would actually be more compact to take the tripod and just extend one leg when I want to use it!
the only reason I want the monopod is that sometimes I like to do a long exposure (like 0.5 seconds) to blur motion while shooting certain assessments, and obviously don't want to set up a tripod so monopod is the next best thing, or try out the 16-35 IS, I have the tamron 24-70 VC and I love shooting that but it's just not wide enough sometimes for the shots I want to make with a long exposure
with that in mind I wouldn't really mind putting on the monopod/tripod for these specific shots, as they're going to be infrequent but...
if I sold the 16-35 2.8 and got the f4 IS, I could also add a samyang 14mm 2.8, and I already have a 35 1.4 so can still work in low light if needed- and i've got the 24-70 at 2.8 so should be covered well for extremely low light work
my other option is to get the fuji 10-24 OIS, and that way I get to keep using my 2.8 16-35 but I still have the option to pull out the fuji when I want to make that long exposure shot- a lot of money for that one shot but it'l pay for itself pretty quickly and i'd probably use the fuji for travel...