It was round about October that they stopped adding additional ECI cabinets to existing ECI and started using Huawei instead.
New lines on the 2nd cabinet wouldn't have G.INP. They likely won't on your cabinet either. Your line having G.INP doesn't mean anyone else on the same cabinet does. It's an individual line DLM profile.
The few examples where it remains on ECI cabinets have all had BT TV at the time the rollout was halted. DLM resets seem to remove it permanently. Taking BT TV after the fact makes no difference.
Is G.INP needed when G.fast comes out?
If its not, then I wonder if they would prioritise ECI cabinets for G.fast as it'll solve the G.INP issue at the same time?
if G.INP is needed then we're screwed for G.fast.. smh
Completely irrelevant. Adding a G.Fast pod with G.INP next to an ECI cabinet without it wouldn't help anyone on the ECI cabinet. They are completely independent of each other. It would only help those taking G.Fast. It's best to just forget the fibre cabinet even exists when it comes to G.Fast.
G.Fast will likely have some error correction like G.INP. It may be named something different, I have no idea.