I won't call it dead because there are still folks who are playing it. But I will call it dead from a "new features/bug fix" angle.
I've been here since 2009. Life grinds on, and with it, priorities. The day that Kornel decided to launch the Kickstarter for Jupiter Hell is the day that DRL fades quietly into the background, partly because of the development time needed to get Jupiter Hell on the road, and partly because by declaring that project on Kickstarter (with references to DRL), it is a very public statement that would (and did) incur the C&D request of using the old name.
DRL is open source now, which means that folks can compile their own version and do the necessary bug fixes/development. But in many ways, it is a hot potato situation from the IP perspective; yes, the name is changed to not overtly reference and potentially mislead the provenance of the game, but there are still many entities and objects that are heavily referencing the source material that are just time bombs in disguise. Because of that, I believe that it is hard for anyone to take up the mantle to further develop on DRL.
That aside, the code base is old. We're talking Pascal levels of old. I can program in Pascal, and probably a few others who are around my age group. But most developers are more into C++, Java, C#, Python, JavaScript and other fun stuff. You might say, "but the game is mostly in Lua!"; yes, but some of the bugs are in the Pascal code itself, and it is not exactly obvious how to fix it. Old code eventually reaches a point where it is hard to maintain, especially when there is no champion for it.
As for whether DRL is still played by me, it's a hard and sad answer to say, not as much, inasmuch as I am still the Chaos Fanatic!. Remember what I said about how life grinds on, and priorities change? Yeah... that.
Also at this stage, my personal opinion is that more focus is/should be placed on Jupiter Hell to ensure that it is successful enough to keep ChaosForge going. It's a lot of eggs in one basket, but it is the choice of Kornel, and I believe most of us are trying to help him there. As such, I think much of the effort of playing/testing is on JH than DRL.
Except Tormuse. He's nuts (in a good way) and is always trying to win every dang medal/badge/achievement he can get. I can't even remember what he hasn't gotten at this point. =)