Departure Controller notes the failure of pilots departing SDL to abide with change to initial climb clearance via BANYO and SCOTTSDALE SIDs. Controller believes SIDS should have been revised when arrival route was changed to avoid procedure conflict.

Narrative

Aircraft X departed Scottsdale on the BANYO departure. The procedure says to intercept the PXR336R to BANYO intersection. However; I issued a heading to intercept the PXR321R (aircrafts route of flight as well as part of the BANYO departure). I even said; 'I say again; intercept the PXR321R.' Aircraft X correctly read back the intercept of the PXR321R. However; aircraft X did not intercept the PXR321R; he intercepted the PXR336R. This happens routinely. We do not have the time to keep up with every pilot deviation. This is during the initial climb phase of flight and most pilots are operating 'behind the aircraft;' whereby; even though they say they will comply with ATC instruction; they are so far behind that the autopilot engages and intercepts the wrong radial. We have been filing paperwork (PDs; UCRs; etc) since the inception of NW2000 airspace redesign. With NW2000 the arrivals into PHX Sky Harbor International Airport were moved from the PXR321R to the PXR336R. Nobody thought about changing the BANYO AND SDL departure procedures. There is now an inherent OPPOSITE DIRECTION conflict. Sky Harbor arrivals are descending to 8000 ft south-westbound on the PXR336R. If the SDL or BANYO departures intercept the wrong radial they will be climbing THROUGH the Sky Harbor arrival.