I dont know if I would go as far as obsolete. Granted the design isnt new but the aircraft system have been upgraded as technology has developed, similar (not the same) to what Boeing have done with the 737. System such as NVS, FMS and updated EFIS (TAWS, TCAS2 & EGPWS) have been added over time (I beleive there is even a H.U.D option).
Its a proven design, it makes money, pax seem to like it and the most critiacal factor for me is that its not an Islander!