In my opinion, I don't think that will happen until they build new rides/attractions behind SDSC. Whilst it would provide a new observation area for AA, there is currently nothing else of interest behind SDSC for guests to visit. Until rides/attractions are built, it would be an empty & quiet path.
I found LW's Chinatown alley to be an empty/quiet path too - if you were not interested in riding/observing the roller coaster or even visiting LW's shop, you were unlikely to walk down that alley particularly with it's long length - you can't even see the queue entrance from the Chinatown entrance. That's why they probably relocated the entrance to near SE as it is visible from the park entrance, you can see the queue entrance immediately, it's in a very open space & a very interesting site to wander around with so many thrill rides/rollercoasters operating.
^Whilst the theming is great, in my opinion, it isn't an exciting place to walk down
Anyway, it is sad to see the Chinatown entrance finally go but better now than never. This is just an idea of mine - not speculation - but I think it would be good if they blocked off the Chinatown alley at it's northern end with the former Chinatown entrance being converted to a Main Street theme (maybe a shop or roaming character photo opportunity site?). The southern end of the Chinatown alley is re-themed to Park Row/Crime Alley while the northern end is connected through to Gotham City Cafe, which has it's Gotham City Hall facade pushed back against the SE sound stages and the entire site renovated so it also acts as a 2nd (or maybe even the) major entrance to AA. This makes the entire area from Gotham City Cafe to AA entirely Batman-themed.
I don't know well the storyline of AA so can't say for sure if the storyline can be implemented down the alley through to Gotham City Cafe but even if it doesn't follow the storyline, my idea would allow for consistent Batman theming at a minimum.