it seems most operators are very happy with SAAB 340/2000
This is very bold statement. What leads you to this idea? Are you a part of Saab operators community?
There are 400+ SF34s and 58 of the 63 SB 2000's flying every day world wide
Incorrect. I don't have 2000 data at hands but last year there was less than 300 SF340 in operation. To be exact last Saab bulletin quotes 239 in airline service, 62 in other operation, 111 stored and 44 decommissioned. Also note some units listed as in service could be in fact stored by airline.