The current generation has also been less exciting sales wise as there was no PS3 vs X360 and no Wii breaking records for its first 3 years. This generation the PS4 easily beat out its main rivals the XOne and Wii U. The Switch taking off has helped breath a little life into sales interest. Once the PS5 and next Xbox are announced and released I see the interest in sales picking up again. It really depends how good the battle is for how long the interest will last.
The lack of sales updates are a factor but the site was well and truly alive for the first year or 2 of no consistent sales data.