I guess the 712's leaving makes sense, as 88 of the 91 are leased. They were nice to fly on, but this makes business sense (esp if they're up for renewal).
763 - I'll miss these. Not sure what this says for Tier 2 markets to places like CDG/AMS. Those markets are prob 1-2 years from returning (if ever).
CRJ (200) - This is by far the best part of the announcement. Delta should hold "Smash a CRJ with a sledgehammer" fundraisers all over the country and kill two birds with one stone.
I do wonder what happens to CRJ200 only markets. Next few years will be interesting fo sho.