Perhaps Miller and Einstein’s return in Season 11 is a sign of Fox truly considering a spinoff.
The two did get a big episode in Season 10, but no news ever broke of a spinoff in the works.
Rumor had it back in 2016 that Robbie Amell and Lauren Ambrose were going to be introduced in Season 10 in order to launch an X-Files spinoff with Miller and Einstein as the lead agents.
David Duchovny and Gillian Anderson’s willingness to return for Season 11 may have played a part, as there can be no doubt that the iconic Mulder and Scully are more of a draw to viewers than newbies Miller and Einstein.