Financial companies have a large incentive to leave if the passport scheme, which allows them to sell their services in the EU, isn't retained in its current form. Other companies - if you do business with the EU, and the trade agreement isn't so favourable, then relocating again makes sense.
There is benefit in waiting, but companies will be planning for the worst-case scenarios.
There is benefit in waiting, but companies will be planning for the worst-case scenarios.