If they'd known how damn long they'd last, they should have put larger RTG's on them and some instrumentation better suited to measuring interstellar space.
Or seen about a Pluto intercept trajectory for one of them.
What V1 and V2 did in terms of terrestrial analogies is like driving a Yugo for 2,000,000 miles without an oil change, and entering some off-road competitions with it on a whim.