The URS rigidity conjecture for higher-rank lattices

Let $\Gamma$ be an irreducible higher-rank lattice, and let a URS mean a minimal subsystem of the space of subgroups of $\Gamma$ with the Chabauty topology. The URS rigidity conjecture. Every URS on $\Gamma$ is supported on a finite set. The source presents this as a topological analogue of IRS rigidity and gives no resolution status.