Incorrect. There has been a large portion of the gaming market, with 3-d graphics, that only require 128mb (infact alot of them don't even need that much).
That statement only stands if we're talking commercial games from major publishers with fancy explosions.
But we're not talking about a game with shiny shiny graphics. We're talking about a turn based strategy that prides itself on a 2d isometric appearance: that is why I'll be disappointed if I can't play Xenonauts, especially as the only system requirements information on the website say,
If that means anything with 128mb can't play the game, then it should be edited.