I'm hesitant to get into it because I don't want it to be used as fodder for debates about 'the cure being worse than the disease'. My perspective is not to advocate for one position or another. But mental health will be another casualty of this event. It would be regardless of no matter what approach was taken.
There is not a lot of past data to go off of to really be able to predict the mental health toll this will have. No one has ever seen an event of this scale in our lifetime. There will surely be more data to come. Anecdotally, there will no doubt be an increase in things like health anxiety, depression, substance use, PTSD, suicide. Good luck treating the person with OCD-related fears of germs. Washing your hands 20 times a day isn't a behavior you probably want to discourage right now. There was an interesting study published
here last month in a prestigious scientific journal about the psychological effects of quarantine based off of previous diseases. I think it is very difficult to disentangle what is driven by concerns about catching a deadly contagious disease and what is driven by the effects of quarantine/being unable to leave the house. They are interrelated and occurred at the same time.
But lots of the things that are robust predictors of poor mental health, like social isolation/loneliness, stress, financial problems, unemployment, uncertainty, are being exacerbated by the current situation. There has been evidence of increases in reports of domestic violence. Being house bound with someone who is repeatedly abusive, who has lost their job, and who is stressed is a bad combo. Additionally, it's been a real challenge for people addicted to substances to receive adequate treatment, in all likelihood making it easier for relapse (and many already do even when receiving adequate care). We should rightly be concerned about the mental health of the public at large. This will have a global effect.