Perfectly suited for say 2xA350s from LHR to SYD and MEL. They depart a minute apart then fly in company for 18 hours, then part ways near TOD. There are not going to be thousands of aircraft from different FIRs suddenly formating to go places. But of course you know that.
Yes, the transition from hydrocarbon is the number one priority, but taking a small step to save ca 10% on fuel on some routes is not a backwards step in the short term. Ignoring environmental benefits, the cost savings alone will be great. The tech is here, the biggest stumbling blocks will be airport slots.
And if they get the slot logistics sorted, and it works out to even a 5% saving on propulsion, that will benefit post hydrocarbon propulsion (whatever form that takes) won't it?