I was under the impression that a lot of models these days were looking at the possibility of the giant planets forming closer to the sun and then migrating outwards. People are looking at this possibility because of the ~120 exoplanets that have been found where most are very close to their parent star. Although there is obviously a huge sampling bias, and I'm not sure how those models would account for angular momentum conservation or what mechanism they propose for moving the planet outwards, it would get rid of the problem of not having time to form in the present location.

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"Why do something now when you can put it off 'til later?" -- me :)