Although you've missed belfast and edinburgh off that list, and I can't remember if Riga and Kaunas were there either, I can't think of many other important European capital cities that are missing from bristol's route network.
Whilst from a personal point of view I would love to see Tallinn added as well as Reykjavyk (seeing as the route from Luton is doing so well I am sure Easyjet will add other routes to KEF), it is great to see that both Ryanair and even moreso Easyjet regard BRS as such an important base. I hope it continues for a long time.
I wonder if any other LCCs will ever set up shop at Bristol? Wizz nearly did and flybe have dipped a toe but I look forward to other Easyjet routes in the near future