In reply to Andreas Nurbo.

+1, untill other data is presented I also believe that people on 5.2 just don't upgrade. neither core nor plugins and therefor should not be seriously taken into consideration.

@otto, pity you took the discussion in this direction as I fail to see why you have to have namespace to have a locator type of service. In any case smart use of autoloading and class versioning might work even on 5.2.