I wouldn't want to travel on journey of several hours plus without toilet facilities. As said, it's down to the individual to decide if they are prepared to travel. I suspect that it will largely depend on how far the person is going, with other factors also coming into play.
I wouldn't expect any sanctions to be imposed on those who decide not to use a train without toilets for whatever reason. Advance tickets should be honoured on the next couple of services at least, and compensation should be considered where journeys are delayed. It should all help focus the minds of the TOC's in trying to resolve faults wherever they can. I accept that some of the issues are caused by passengers, but poor design and cost cutting also seems to contribute to how easily things go out of service.
I wouldn't expect any sanctions to be imposed on those who decide not to use a train without toilets for whatever reason. Advance tickets should be honoured on the next couple of services at least, and compensation should be considered where journeys are delayed. It should all help focus the minds of the TOC's in trying to resolve faults wherever they can. I accept that some of the issues are caused by passengers, but poor design and cost cutting also seems to contribute to how easily things go out of service.