If it's not running, it will likely be on the platform in Fort William where you can at least admire it.
That is a very strange, and unlikely speculation.
The locomotives and train cars are based at West Coast Railways depot at Carnforth in North West England (where they are now).
They are transferred to and from Fort William before and after each season.
If the ban on operation holds it is, in my view, very unlikely indeed that the train will be brought up from Carnforth, train crew paid to be based at Fort William, the money paid to have one locomotive in steam each day, and the track access charges paid to Network Rail to use the platform as a static exhibition, when there is little or no revenue to be obtained from such an expensive exercise.
It is actually unclear if the train cars can even be moved empty on the National Rail Network under the ban (from Carnforth to Fort William), given the uncertainty over the safety of the car doors- the reason for the ban.