As said by Sild, the Mechwarrior franchise already has a game due for release this year.
Here's some game play video for an idea of what that's about:
Additionally, there's a turn-based Battletech game that recently came out.
Here's a review on that game -
As such, those bases are already covered by other developers, so, it's not really a new idea, and CDPR is already quite busy with wonderful things, and as much as many of us would love for them to make ALL the games with the amazing quality they're known for, they don't own all the licenses for all the games, and, other developers will do what they do, for better, or worse, and, it's our lot to settle with that's on offer, or, spend our money elsewhere to show how we want games done.