United/Continental will start to take delivery of the 50 B787 from next year and with a fleet of over 700 aircraft I think they will find an aircraft for SFO - DUB. I don't think they will take up the route but Aer Lingus will in time.
There would be high demand for RIX at this time of year. Many who go home for the summer will be coming back over the next week or two.
(Holidays) Czech Airlines will not operate from Dublin this winter. Its not know the reason for the pull out but Europe Airpost will take over most of the routes.
Aer Lingus and Flybe to pick up some of the flights as well.