Current Injection Via Jumper Design Help
No, there is nothing wrong with floating the wiper of the potentiometer. You will simply "waste" 1.67mA of current through the upper part of the circuit.

Is this circuit really doing what you want? A current source designed using just Ohm's Law is extremely sensitive to changes in the load. If the resistance of the load changes, so will the current through the circuit. If your load does not change or is not sensitive to changes in current, then I guess you're ok. Do you mind explaining what this circuit is for?