Traffic laws, signage, lines, traffic control devices, etc. serve multiple masters:
a) To define the rules of the road/help make things safer;
b) To make it easier for cops and lawyers to declare who fucked up when an accident happens;
c) To generate revenue (In unscrupulous jurisdictions, of which there are many).
Other posters have touched on the dubious logic behind removing lines making things "safer." This is sketchy on a). It actively detracts from b) (whether one thinks that's a good thing is another matter entirely). And I can't see it helping c)... no more "your wheel went an inch over the line once a mile back" pretext pullovers.