Although David Duchovny and Gillian Anderson have said in the past that they are happy to do another film, I highly doubt that they would want to go back to doing a TV series when they have moved past that now, and broken free from everyone seeing them and purely Mulder and Scully. I for one am enjoying seeing Gillian Anderson in different roles now. For that reason, I wouldn't want it to return as a TV series.
I would love to see the X-files return but with new actors and new characters. There is a lot of awesome scripted TV out right now, but not much of it seems to be sci-fi. An X-files reboot could easily fill that niche.
Every thing has its day - I loved the X-files but it wouldn't be the same bringing it back as in most shows. However another movie would be okay as long it was a very good script and did resolve things and not leave things up in the air for more sequals.