If he where a striker I might've agreed with you, because someone like Trez or Vucinic might just whip out something and score\create something huge. But Vidal has some HUGE responsibilities in the midfield, if he slips up too many times he'll cost us games. Not to mention we've got great depth, we gotta use it! I love Vidal, but I'm really not up for a crucial player to our midfield and defensive set-up slipping up.
As for Pogba, LOVE HIM! A few more 15-30 minutes cameo's and he'll be ready for full games hopefully by half way in the second half of the season.