Of all 4 North teams, I'd see them as least likely of the 4.
But -- if everything fell into place for them -- defense being a top D all year, the offense continuing to develop and progress, given how relatively open the NFC is, yes, not impossible.
It seems likely to me that the North sends 3 teams to the postseason, maybe even 4.
At some point I do expect the Vikings to regress. Probably starting with Detroit next weekend.