So, if there is some resistance they encounter with the mono, they won't get more aggressive and try to overcome?
Dinner is that way!
They will only wade in unless they know the water is exceptionally shallow and then they may land in the water. If you set the line up where they can't wade in as it's too deep on the pond side you're good to go. An electric fence would be more fun to watch though.

Some day I may put one up for kicks. As I've said here before I've heard they do a awesome break dance when they make contact.
The truth be told I'm running behind on the big pond and don't have my line up yet. I've had it up so many years the birds seem to have given up. Last year I only staked the areas where the bluegills bed near shore.
I also don't have small fish to eat in that pond. The yellow perch and big gills stay deep except for spawning time.