In 2-3 years they would need to decide on training systems built in 3-5 years, and by 2027-2029 the scale might get to $200-1000 billion for an individual training system. (This is assuming geographically distributed training is solved, since such systems would need 5-35 gigawatts.)
Getting to a go-ahead on $200 billion systems might require a level of success that also makes $1 trillion plausible. So instead of merging, they might instead either temporarily give up on scaling further (if there isn’t sufficient success in 2-3 years), or become capable of financing such training systems individually, without pooling efforts.
In 2-3 years they would need to decide on training systems built in 3-5 years, and by 2027-2029 the scale might get to $200-1000 billion for an individual training system. (This is assuming geographically distributed training is solved, since such systems would need 5-35 gigawatts.)
Getting to a go-ahead on $200 billion systems might require a level of success that also makes $1 trillion plausible. So instead of merging, they might instead either temporarily give up on scaling further (if there isn’t sufficient success in 2-3 years), or become capable of financing such training systems individually, without pooling efforts.