I'm so addicted to Downton Abbey, I hate the idea it will be going away. However, they are clearly making plans for the downstairs people to have lives outside the house. Eventually, these big houses didn't have help like that anymore, so it's inevitable. If you'd like to get into more info on the series, go to this site.
http://www.pbs.org/wgbh/masterpiece/downtonabbey/
I also love Grantchester and hope it will go on next year. Also, Mr. Selfridge, Call the Midwife, and Bletchley Park. If only some of our American networks could produce this quality of entertainment instead of the "reality show" garbage or contstant gruesome murder stuff.