Like it or not, +Pell has yet to be convicted of anything.  No trial has started and no evidence presented.  Once this all shakes out, and if +Pell is indeed convicted of sexual abuse, then the pope will have no choice but to remove the cardinal from his Vatican office and probably his performing Mass in public, with other sanctions as well (let's not forget that little adjustment to canon law +Francis himself made about errant bishops!).  Enforcement will be of no problem, since +Pell will be sitting in a prison cell or on house arrest - with the press camped right outside his door as they now are in Rome - and his movements scrutinized.  But until the courts in Australia have their way with Rev. Pell, the pope can do nothing more than he has.  A Vatican trial would need to be done if Pell is available for it.  Don't set us up for major disappointment before this all unfolds.  Patience.