The current pace of advance is such that within five years we'll surely have made substantial further progress. We will not only agree that the value of H is known to 10 percent - we'll agree what that value is.
We'll know the key parameters (from high-z supernovae, from the CMB, from high-z observations, and from improved statistics on large scale clustering and streaming. I'd even bet (though maybe I'm being a bit rash here) that we'll know what the dominant dark matter is.