The Season 6 finale set off the events which led to Natalie getting fired at the start of Season 7. When Andrew Schneider and Diane Frolov spoke to TV Line, Andrew also teased that "we're only in Season 7," so "who knows" what the future really holds for Natalie and Will.
However, he didn't confirm that Natalie will return to Chicago Med by the end of Season 7 or even in future seasons.
But there's certainly hope there. Torrey DeVitto, who plays Natalie on Chicago Med, is in the 2021 Hallmark movie The Christmas Promise. She's also in the upcoming movie Skelly. She hasn't moved on to a new TV show yet, so it's possible that Torrey could return as Natalie someday.
Watch Chicago Med on Wednesdays at 8 p.m. EST on NBC.