Barring injuries, if we can't get past the first round again this postseason, especially if we have homecourt advantage, then I think it's clear that in the summer of 2018 we need to take another direction, i.e. not resign IT and AB to big money and move forward with our younger core, especially if we get a guard to pair with Smart in this upcoming draft.
That doesn't mean we blow it up this summer, and that also doesn't mean that we should forego signing vet free agents like Noel, Hayward, Griffin, Milsap, etc.
However, it does mean that we shouldn't blow our future assets, specifically the Brooklyn picks, for marginal upgrades to our current roster that is inherently flawed. That'd give us a full extra year, or at least half a season before the trade deadline, to evaluate the upgraded roster with the additions we made over the summer, and we should have a pretty clear picture of what direction we should be heading in by the summer of 2018.
To me, all else being equal, if we don't make the ECF by next year's playoffs, then I don't want to resign IT and AB and would rather move forward with our young core.