I think it is the way to go to enhance safety and increase crew competentcy. The question as always is cost, although I know of at least one big UK operator putting their crews into the sim once a year now (ie. LPC). I think for corporate a yearly sim is fine (as opposed to 6 monthly) and then the OPC in the aircraft after 6 months.
I haven't been in the sim since 2008 (my XLS initial) and have done every single LPC/OPC in the aircraft. It always feels like a tick in the box as opposed to a positive and continuing learning experience (as well as hard work!
).
P.S. Still on the lookout for a full-time job (damn those Netjets guys!
)