How fast was the first car? How fast is the fastest current car? How long did it take to come up with something that can fly and how long could it go for? Or something that can leave the earth, never mind the solar system.
The current voyager getting nowhere and finding nothing doesn't mean none ever will.
I hope one day engineers can develop a renewable source of energy that can mean space travel is much faster. Current materials like plutonium have a short life span. It will also never be lightspeed though.