Good snipers realize thier bullet is a 1 shot kill at all ranges. You just aren't gonna be at the top of the list sitting back sniping.
Edit* if you know your enemy is trying to shotgun you should win just by simply not being stupid and staying outside his range.
Edit 2
Fusion rifles are for people who sxck
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people still do, most people don't take up this mentality, grab Praedyths with files scout, or just camp high traffic areas much like any other secondary would, they just camp a different spot. there's always the exception but when it comes to secondaries, camping is usually involved