A long term problem for those who experience the virus very strongly is that - thereafter - they have 'underlying conditions'. Which means that the next regular flu or any 'normal' illness that they contract, could be very much more serious than it would otherwise have been.
This long term burden on the populace and the health service and the country is unknown - but will be counted over the next years. Yes, most who get it make a full recovery but others do not and may find themselves unable to work due to their new health condition.