Yep. But: the upcoming eruptions could limit or destroy access routes, change geothermal patterns, create other nearby health risks – or even, as you put it, result literall in "the whole thing being swallowed by a lava fissure".
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.