Do I recall correctly that Descartes came up with a grand theory of vortices, which did not pan out? These overarching theories always seem to stumple on the lack of supporting evidence. Maybe wait awhile. The Hubbell and its successors may bring enough data that we can build a theory on, Right now, we might as well assume that angels push things around.That way we don;t have to worry about predictions. Just say, Que sera, sera,
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Successors (principally the James Webb) will finally be canceled to fund muslim outreach. Hubble telescope doomed without shuttle to repair it - sometime between 2019-2032. At which time, China will determine what the US does or does not launch into LEO.
Expect these things to happen in Obama’s second term - or in his third, but definitely by his fourth term when space will be something which happens in other countries and in the US will be the distance from one ear to the other.
USA enters space with a bang, but goes out silently - not even with a whimper.