I am sure that your article said that it's newer and the launch event was on the plane of the ecliptic.

I read that one too.

Anyway, the Wikipedia article says:

  After 2036, both [Voyager] probes will be out of range of the Deep Space Network.[14]

As for New Horizons:

  [The RTG] will decay too far to power the transmitters in the 2030s.

So we could lose contact with three in succession. Or, the DSN could become even deeper!