I'm not sure why this is being downvoted since there is considerable evidence that a new fissure might open very close to this area. The three eruptions in the last few years on the peninsula have not been far from Blue Lagoon.
It's worth noting the area is surprisingly flat. Flat like sandpaper - it's not at all smooth, but there's not much of a gradient either. Essentially whatever the volcanic version of a flood plain is. So a surface fissure here could be quite problematic. It's very close to the power station, very close to the resort, and there's not a lot of geography to channel it away.
Peninsula / coast / power / airport / key roads all pretty close, and an eruption could be bigger & longer.
I do have immense confidence in Iceland's ability & expertise to adapt no matter what. They know their land, & the geo science, very well and can coordinate/cooperate on a rapid, large scale.