Future of Predator and Reaper UAV's

Strategy Page can be occassionally quite poor in it’s reporting, but this article is interesting:

http://www.strategypage.com/htmw/htproc/articles/20130501.aspx

Basically it asks the question of the the future of slow and large UAV’s ala MQ-1 and MQ-9.

Last time these were used in combat against a reasonably organised (if poorly equipped) opponent was Serbia in 1999, where some 24 were lost to various causes including at least 12 to enemy fire and possibly a further 7 to jamming or enemy fire (mainly rocket/jt powered CL-289s).

All of the 12 confirmed losses to enemy fire slow moving Predator/Hunter/Pioneers/Crecerelle.

You don’t need an S-300 or S-400 to shoot one of these down. The ubqitious ZSU/ZU/Bofors light AAA are sufficient.

I can see the USAF and other agencies retaining some numbers of drones for the peacekeeping and counter terror operations.

But is 400 odd examples too much? Is there are any worth for such a large fleet in contingency plans against China or even Iran?

Similarly the US Army is also left with a legacy system of limited utility in conventional warfare in form of MRAP vehicles. Great for counter insurgency but really offering any significant advantage over soft skins in a conventional war.