I don't know. How many attacks happen that have a budget in the thousands of dollars (that's what I ballpark the price of a load bearing drone to be)? I presume a lot. Another way to look at it is, how much does personal protection cost? Bodyguards, etc. If your attack methods are cheaper and at least comparably effective, they're good.

Considering IED drone effectiveness, I think it's just a question of developing tactics and maybe custom tech. It doesn't sound complicated to have a drone descend vertically at such high speeds that even if you notice it and disable its motors it's too late; fuse set to airburst. Exciting time to be a narco weapons engineer.