Their goal is simple: make as much money as possible! There is really no point in hoping some improvements from them, only sales talk. There hasn't been a major improvement in a very long time to their games, no "wow" factor, nothing groundbreaking, nothing in their actions to prove they're more than after your money. They won't change the engine to ID tech, because "schooling" their team with the new engine takes time and money, plus you tend to lose potential benefits brought by the modding community which (like another "syster" company, Bohemia), fix their games and add a lot of value on top.
They're doing well and will do so until other companies supply good enough (perceived) quality products to cover the demand. Then they will be change forced by the market, not before.