Year-round schooling would necessitate a change in the way extra-curricular activities are structured, not a reduction in such hobbies. Shorter breaks of two or three weeks are more than sufficient for most extra-curricular activities and by spreading them throughout the year, instead of ring-fencing them into a couple of summer months, their beneficial impact might well be greater.  If year-round schooling reduces the necessity to send students for extra tuition, as is common in some countries, then this should be considered a positive benefit of the change, not a problem. Families whose children are being educated year-round will have less reason to spend their hard-earned money on expensive and often unnecessary private classes.