It's still being played. There are some plans to write an android client (notably by Trench War's poid, on patreon as quantumspace). Its golden days are long gone, but it's not uncommon to find games with 40 active players in Trench Wars these days.
I played this game for years in the competitive leagues and as a moderator running special events before life responsibilities took over (still pop in occasionally) is super fun. I was never very good at it though :)