A solid recovery that would continue indefinitely if not for the coming Trump recession, so that's good.
The recovery turned from a mostly upper-class phenomenon to a broad-based real recovery through Obama's second term, with an unprecedentedly steady run of positive job creation since mid-2010, which he deserves credit for. I wouldn't use the word "indefinitely" though. The economy is an inherently unstable and poorly understood system, with recessions recurring quasi-periodically, and it's not at all unlikely that the next recession would happen with or without Trump within the next four years. That said, Trump and the congressional GOP will definitely push the system back toward bubble behavior by dismantling regulations, including much of Dodd-Frank, so that he'll deserve much of the blame when the crisis comes.
I think the following situation is fairly likely in the alternate universe where Clinton got elected this year but nothing else is different:
The Dems still fail to win the Senate and House in 2016, then suffer bad midterm losses in 2018, particularly in the Senate. Then, the recession of 2019-20 starts at a very inconvenient time for Clinton's reelection prospects. The result is that Cruz (or someone equally loathsome) clobbers her in the presidential election, they lose even more House and Senate seats, and on the state level, the Reps have absolute control of about 40 states during the critical post-Census 2021-2 term, allowing them even more gerrymandering power than they had this decade.
At least the way things are working in our current universe, the Dems will probably be able to limit their Senate losses and win some House seats in 2018. By 2020, Trump will likely be widely seen as incompetent, with approval ratings in the 30s, and some of the nastier effects of Republican policies will have become obvious. As long as the Dems learn how to become effective politicians in the next four years, they would be well-positioned for a 2020 wave election and the gerrymandering privileges that carries.
As for Obama's legacy, he'll be sandwiched between two incompetent presidents. The contrast will cause people to have a positive impression of his presidency, in retrospect.