The only thing with monitor USB hubs is, at least on my Dell, if the monitor went to sleep the USB would disconnect.
I will only be using the extra USB's to connect cameras when I need to download images so not likely to be an issue.
Is that such a bad thing? Only my keyboard & mouse are plugged into the monitor. If the monitor's asleep, I'm unlikely to need those.
Does your PC wake from the monitor when plugged in there ? Mine never did. It's worse if you decide to read from USB disk over a network and it disappears ... just realised, a wake on LAN alert would probably have solved that.
Responding to IanW's comment Kronos, and no, it's not going to be a problem for the cameras you wish to connect.