Dredd had a really poor advertising campaign. I think the first trailer only came out a few weeks before it's release when for other films it's months in advance.

I think the first footage I saw was actually a VFX breakdown that somehow made it's way into YouTube but it didn't stay there long.

There was a big campaign to get a sequel and Dredd on Blu-ray rose to #1 in the Amazon sales charts.

One of the executive producers, Adi Shankar, explained in a YouTube video that he appreciated the effort but the big problem was the box office returns. Everyone who invested made a loss, so no one wanted to invest in a sequel.

Rebellion were going to make a Mega City One series which may have had appearances from Dredd occasionally but I think that project has stalled.