According to a report from NHL insider Sarah Civian, Thatcher Demko will miss the remainder of the playoffs - meaning he'll be out until at least June. This lines up with a report from Elliotte Friedman the day before that he heard rumours Demko's injury is severe.
When he's been healthy, Demko has been one of the league's most elite goaltenders. In 51 games this season, Demko posted an unbelievable .918 save percentage and a 35-14-2 record. The Canucks have played a much more complete game under their new coach Rick Tocchet, but having a full season of a healthy Thatcher Demko has been one of the biggest reasons for their successful season. Without him, the Canucks will be in rough waters.