This article develops care for possibility as an ontopolitical alternative to urbanism organized around immunological enclosure. Rather than treating care as the redistribution of existing functions, our argument reframes it as the protection of spatial openness, i.e., the lived condition through which emergent forms of life become perceptible. Drawing on current literature, we show how planning rationalities foreclose futurity by enforcing legibility and spatial finality and reframe care as the safeguarding of spatial indeterminacy to argue that the urban condition ought to depend on protecting the not‑yet rather than optimizing and exhausting the already‑given. To ground this intervention, the article examines Morocco as a spatial and cultural laboratory where colonial enclosure, sovereign hybridity, and rural-urban hydrological infrastructures reveal the limits of immunological urbanism. Across Rabat, Tangier, and Beni Mellal, our analysis demonstrates how interspaces sustain incompleteness despite pressures toward closure. These cases show that openness is a political and cultural resource, emerging through contradictions within postcolonial territorial authority. We conclude by redefining the planner as a mediator of thresholds, responsible for sustaining relational vulnerability and spatial indeterminacy as infrastructures of futurity.