It's a nice suggestion and all, but I do believe it is a bit early to get too excited about this. For me personally the reason is or rather a question: "How Ambrosia can move on to other games, while the game it is based on has constant problems?" What I mean by this, the quality of our DD2 currently is at its lowest stage in years gone by and if we are looking for quality gaming, we should focus on fixing the servers first which are our main target and then open new games such as CS:GO.
I also personally believe that CS:GO would be a great addition and even I have suggested to shut down all servers apart from the 3 most active ones and open CS:GO servers. But when I think about it, it would rather be a move of desperation to save something that is going downhill like a speeding train.
On a second thought, your suggestion is great and I wouldn't expect anything less than what you said due to CS:GO being in competitive level, I feel like it has a great chance of success if done properly, but as I said, the performance of our servers on CS 1.6 is rubbish comparing to few years ago. Even tho the argument is the game is dead and everyone is starting to give up on the game itself, it is not entirely true. The game is still played by lots of people, there are full servers in other communities and this community was based on CS 1.6, it should contain and be the main focus until the game indeed dies.