time-dependence of cosmological constants

In cosmology, we define all quantities by their values today. Would we need to revise their numerical values in the future? If yes, on what time scale?

bonus question: What’s larger, \(\lvert\pi^\mathrm{i}\rvert\) or \(\lvert\mathrm{i}^\pi\rvert\), with \(\mathrm{i}=\sqrt{-1}\) (principal values only)?