I don't think anybody here is expecting an "iconic marble palace". Just something that befits an airport already in Europe's top 20, and apparently with ambitions to go much higher. Maybe the new TP will achieve that, time will tell - and yes it is a balancing act between catering for all newcomers whilst not scaring away what you already have with high charges. I do however still have difficulty reconciling statements from different sources referring to the TP as "broadly capacity neutral", and on the other hand "another 10m passengers over the next 10 years, and 55m by 2050".
For the record LGW's EK offering and pax throughput at LGW is currently very similar to MAN's with 3x daily whales - the 4th daily LGW didn't last long (not sure if it even started). The bulk of the BA & VS operation at LGW is leisure based, and it doesn't yet have service from the likes of SQ, QR, EY, UA, AA, WY, SV and some of the European so-called legacies.