Yes, Bumblebees are beneficial. You can seal the hole and if there is an alternative route they will use that route instead.
Unlike bees, whose colonies contain thousands and tens of thousands of bees. Bumblebee clusters tend to be quite small with only several dozen bees.
They tend to be quite docile and do not pose much of a threat to anyone that does not suffer from severe allergic reactions to bee stings.
Bumblebees on a whole are in decline in most major Industrialized nations, mainly due to habitat destruction and pesticides...
...all those pretty manicured lawns come a price well beyond monetary cost.