Other potential users: People who are overseas who need to make transactions, but don't have cellular roaming available (whether by choice, or because the carriers don't have a roaming agreement), but can get Wifi. This particularly applies for travellers.
Solution: I'm creating an android app + webservice + chrome plugin to do it automatically. So the app reads the tan from the sms, sends it to the webapp. The webapp sends it to the browser plugin. Browser plugin enters the tan for you. ... Huge win :)
User base: everyone who does online banking with sms TAN 2fa but can't be bothered to enter the tan manually/doesn't care to much about security. ... So basically just me I guess ;)