So, putting expensive new cameras in the aircraft will solve the problem of not being in the right place at the right time? It will certainly improve the thoroughness of the search once the offenders have left.
The very old saying goes like this....if they're there, we've got a good chance of finding them, if they're not there (because it's taken ages to get there and they've left) we'll NEVER find them.
As for the near miss scenario, whilst GA plans flight along straight lines from A to B, with a mindset that anything unplanned (in the way) can't be part of the equation and adds to the fuel bill, police helicopters hovering into wind at a search scenes are vulnerable. Can't count the number of times in CAVOK that GA fixed wing has been unwilling to deviate or unaware of a 3 ton blue and yellow fixed object filling their windscreen and I've had to take avoiding action by flying out of the search. When you think about it, there aren't many aircraft in the UK hovering at 1000-3000' in broad daylight that aren't actually involved in a serious task, I'm not saying other aircraft don't have a right to be there, just think about why that helicopter is there and go around.