In light of the recent Blu-Ray announcements, I will continue to watch my SW LD's for a long time to come. I've got the 89/90/92 releases, the 97SE set and even the TPM JPN release too. Till I get everything transferred, the 12" silver discs are my preferred route for enjoying the films in the versions I saw in the cinema and on TV.
Besides, I have a stack of OOP Criterion discs and other stuff that seems unlikely to ever see the light of day on newer formats.