Since Mr. Pool could handle the problem himself, Durin wouldn't bother about what would happen on Eternal Day Island.
As for the life of 'working ten hours a day, with two days off per week, and earning twenty pence an hour,' under the backdrop of this living hell, it's already overwhelmingly merciful.
After all, before today, the workers in the textile factories worked sixteen to eighteen hours a day, earned only five pence, and the most horrific part was having no days off throughout the year. The average lifespan of a worker was just three to five years, with at least ninety percent dying from overwork.
