Orphanides's comments are based on the assumption of a just and viable solution that will be implemented without significant problems. On this basis, they of course make sense, because Cyprus will gain access to the large Turkish market etc.
Noone, however, should forget that Cyprus economy depends fully on 2 sectors: Tourism and international business services. These 2 require strong political stability.
If a solution similar to the Annan Plan is found, which was fundamentally unfair and included a lot of scope for disagreements, deadlocks, conflict etc (e.g. think of the reaction of those who would be denied their properties), then there will not be political stability.
This alone could destroy the economy OVERNIGHT and GCs' standard of living (in financial, security/safety, social and any other terms) could vanish. The entire way of living could be demolished.