Where do attack helicopters fit into modern war, out of curiosity? From my very uninformed point of view -- seems like in a world where man-portable weapons are getting more and more capable, being in a relatively (compared to jets) slowly moving, lightly (?) armored flying vehicle would be pretty terrifying.
Manpads really aren't all that effective against helicopters. I don't think anything has fundamentally changed in the past 40ish years in regards to the ubiquitousness of manpads or how they work. Helicopters are comparatively cheap, effective, flexible and difficult to shoot down without proper AA, but that's what combined arms is for, or a lot of luck. Only about 40 helicopters were lost to hostile fire in Iraq from 2004-2009. I'd say the flexibility is the main reason why you can't get rid of helicopters in modern armies. There are just things that planes can't do without protected airspace or a controlled airfield.