England beat Italy 57-14 at Twickenham to consign the visitors to a last-placed finish in the standings for the fourth year in a row.
Italy, who entered the Six Nations in 2000, have finished in the bottom two every year except when they finished fourth in 2007 and 2013.
“To improve it (the Six Nations) you’ve got to find a way of making sure you’ve got the six best teams in Europe always playing in it,” Jones told BBC Radio 5 Live.
“I think they should always consider rewarding merit, it doesn’t matter what competition you’re in. If that involves relegation then it’s something that should be looked at very closely....
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