If Votto has 6 straight years of 2013 he is absolutely a certainty for the HoF. No question about it. You are forgetting power numbers are down across the league. Only 3 batters in the NL had 30 or more home runs last season.
Votto had the 7th most in the NL.
Votto had 10th highest Slugging % in the NL.
On top of that Votto had:
Highest BB% in NL (3% higher than 2nd best)
Highest OBP in the NL