My view on Pier B is that the Airport wants to increase capacity and shift the focus to T2. To do this it needs to spend a lot of money on T2 including the link to T1 and onto T3. It may therefore not have the money to replace Pier B (right now) which would not necessarily have any capacity enhancement at this stage either. Perhaps after this masterplan is complete, there will be another stage.
Also worth noting that assuming all wide bodies are moved to T2 then we'll only be seeing aircraft no bigger than a B737 / A320 on Pier B in any case and possibly smaller aircraft than that in general. It won't be such an issue with fewer passengers.
It's a shame that it's not going though.
One other thing I find odd is that the T1 departures area is apparently going but to me this could still have a function as an intermediary lounge area for pax checking in from either T2 or T3 and using gates in that area.
Let's not forget it's still early days in the design as well.