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It also shows Trump's quick mastery of the political process. In one move he both reassures the Republican base and turns a potential campaign issue on its head. Now Hillary can't raise the question of SCOTUS appointees on the campaign trail. If Hillary wants to question Trump on this she has to question specific names, not some anonymous bogey man, and immediately opens herself to the question of "where's your list?"

Again this shows that Trump is several steps ahead of her in terms of strategy. It also effectively stymies Obama whose Garland nomination is now just twisting in the wind while the focus is shifting to the Fall campaign and the next administration. SCOTUS will do just fine with 8 members until after January. Their latest unanimous slap-down of another Obama overreach shows that even without Scalia the court is still an independent branch of government.

Beyond this, Trump continues to control the narrative, which is something Hillary has no idea how to deal with. The "slow squeeze" continues and at some point she's going to crack in spectacular fashion. The Dems sense this, which is why the increasing levels of anxiety in the party about their deeply flawed presumptive nominee. Just as the Republicans before them, the Democrats are now working their way through the stages of grief leading to acceptance of Trump as the next POTUS.

Lots of great points:

He unites the ‘concerned conservatives’ - solids the base.
He takes away the power to succeed to appoint from BHO.
He forces his opponent to counter with a list of candidates.