I would see it as a positive development if OCD (and other 'mental health problems') would simply be classified as neurological problems in the future. Because that is what they are. OK, OCD is strongly linked to behavioural changes and moods that are not really welcome... but aren't brain haemorrhages, Alzheimer's, other forms of memory loss, Parkinson's, and Huntington's too? Or autism, or ADHD, or eating disorders?
I would find it a welcome leap if the general public would get to know that OCD is not a voluntary act, but much more an impairment of our free will, we can't simply stop our fears, worries, and acts related to OCD.
In principle I don't really object to the term 'mental' as to its true meaning, which is just: related to the mind. But in expressions like: 'he's gone mental!', it's become highly peiorative.
We may have good hopes for the future. With the advent of ever more precise scanning techniques (which are multiple by now, with high resolution), we can show what's going on in OCD. Some brain parts are overactive, with a higher turnover of molecules necessary for cell viability. In other spots, brain white matter (which isolates brain fibres and causes electrical signals to travel faster) is affected; it may be less dense, and also have lost a bit of its proper direction. Many of these features are reversible by good medication and CBT. So really, prospects are good - but these matters need to be put forward in public debates.
Best, Cuthbert.