It's a good reason to push for more space telescopes.
I believe some day (probably after we start having regular interplanetary travel) we'll have robotic light recorders in space recording every bit of incoming extraterrestrial light, especially on the planetary plane. Then we'll be able to back up to view where objects like these entered the system, not just after they are detected. And perhaps just detect them when the are entering the system to give us as much lead time as possible.
We do in fact already concentrate our efforts to look for objects near the ecliptic. It's the number one recommendation followed by amateur asteroid/comet discoverers. But actually, interstellar objects might be more uniformly distributed - even Oort cloud objects are supposedly non-aligned with the ecliptic. If anything, I'd expect interstellar objects to be slightly more likely to come from directions roughly along the galactic plane.
I am curious if anyone is actually thinking about this problem in terms of technology required that currently does or does not exist, particularity in tech needed to store such vasts amount of data, unimaginably high resolution sensors, etc. It sounds like a fun project to be part of really.
I believe some day (probably after we start having regular interplanetary travel) we'll have robotic light recorders in space recording every bit of incoming extraterrestrial light, especially on the planetary plane. Then we'll be able to back up to view where objects like these entered the system, not just after they are detected. And perhaps just detect them when the are entering the system to give us as much lead time as possible.