Mrs Miggins
Eternal
That is really my one concern. The Kiwi Idiot's smart TV has stopped working with at least 1 NZ TV app because it has updated beyond the capabilities of his telly. Reckon he's had it 5 years though. I am keen to get something that is not going to be obsolete in 5 minutes but that's probably difficult given the speed at which this stuff changes.That's about right (although if the app supports it you can use the phone whilst it's playing)
However if your buying new kit then that's probably a better solution. I worry that smart TV makers won't update apps, but it's not something you have to worry aboard for a few years and you can always add something else in future.
there are plenty of apps you can get 'pay films' on them. Really would not get ANY subscription unless you somehow run out of stuff to watch 
as and when the pop up