Hackers are a diverse lot.
1) There is the counter culture like Anonymous, they will break into government computers (linux or wintel). Lulz will do just everybody if you happen to piss them off...
2) There are criminal hackers like the Russian Business Network. they will break into anything where they expect to make money. Wintel offers bigger bonusses than linux, but that's not much of a safeguard.
3) State hackers like Chines Army, Iranian Guard, Israels Mossad and the American agencies like CIA, FBI, NSA. They will break into anything, which they suspect, Linux, wintel or Apple. Not much of a safeguard either.
In the end: with the rise of Linux there will be more break-ins. And a lot of break-ins are browser-attacks...
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