When the one-life battle game mode arrives (if it ever does), I imagine all Skirmish players will want to flock to that instead. Just like all the other game modes, a one-life game mode wouldn't work well with the current class system, since the current class system is literally founded on imbalance, with the amount of lives per round being used as the only counterweight to that deliberate class imbalance. Any semblance of balance that TW has attempted to create through this terrible balancing act completely falls apart when players are restricted to a single life per round.It's fine for skirmish and captain, but it's completely garbage in all other gamemodes.
They've been wasting their own and everyone else's time developing the class system around skirmish mode (and hilariously attempting to do it in tandem with balancing the same class system around captain mode.) This problem was pointed out by several people over a year ago by now, and TW is still going at it, stubborn as ever.
I'll just keep eating my popcorn while this game continues to be in development for the next 10 years because TW is still trying to figure out how to make a single, intentionally imbalanced class system work for all game modes.