However, it addresses the problem only from the point of view of the hiree. For companies looking to hire people, the typical interview process is equally a problem.
I think the "dating" process described by the OP sounds like a good solution for the hiring company. It's also a good signal to the employee that the company is serious about hiring the best, using the best methods.
The "dating" process only works when both parties are available. If the candidate currently has a job asking them to take time off (or worse, quit without a guaranteed offer) is asking a lot.
However, it addresses the problem only from the point of view of the hiree. For companies looking to hire people, the typical interview process is equally a problem.
I think the "dating" process described by the OP sounds like a good solution for the hiring company. It's also a good signal to the employee that the company is serious about hiring the best, using the best methods.