The next ESA decision, expected in early 2011, is between IXO, LISA and Laplace (mission to Jupiter), all of which are competing for a launch in about 2020. Officially, crunch time for Euclid is a year later (in competition with PLATO). Of course, the similarity between Euclid and WFIRST is likely to cause some horse-trading between NASA and ESA sooner than that. There is no suggestion in the report that the US should take the lead on LISA; instead it says that if LISA is not chosen by ESA next year the US should re-prioritise its own programme.