Volcanic activity on earth is, as seemingly all things are, cyclical.
That said, the volcanic record suggests that we are still mired in a thousand upon thousand year drought.
There is no explanation as to the cause of the calmness for the conditions internally have not change within the earth.
So that said there would be nothing stopping an all out volcanic outburst worldwide creating an inhabitable environment or it stays this quiet.
Tambora was only 199 years ago. Slate has a good article on tamboura posted yesterday ; my cell service provider is having issues with google so I can’t provide link