You think the AAHK shopping centre managers care about making it easier to get from one runway to another? The aeroplanes are just a means of transporting shoppers to/from their their retail lessees.
Retailers and service providers have pretty much told AA they are not interested in the 'toaster rack' style of terminals as it dilutes their exposure to the expected 100 mill pax.
So guess what, the third runway terminal is just going to follow the current Y shaped ends of T1, with all the usual pushback conflicts and long taxi distances.