If GPS is there to use then use it because it's just another tool for navigation, but sole reliance not only encourages laziness but is just asking for trouble. GPS is subject to interference, incorrect entry and misinterpretation just as other navaids. I have been taught that all information should always be cross-checked vigilantly.
At our school we are reminded of the clown that set a direct GPS track from Archerfield to Cairns and flew it, incurring numerous airspace violations needless to say!
I agree students should learn all traditional nav techniques and if GPS is there to be used, then it should be taught too. If we are taught to be sceptical of the GPS just as we are radionavaids then there shouldnt be a problem.