It's gonna be like FRA - plenty of remote gates with buses running all over the place.
Of course, I don't see JQ beating a drum for more jetbridges. They are low cost, so they'll take whatever they can get without having to hand over more money to SACL. So, probably a bad example.
On the other hand, there have been a couple of times where I have arrived on a non-JQ international flight and we've been told to wait whilst a jetbridge is vacated for us. Since I take it that not every jetbridge is the same (so it's not like a parking lot situation - doesn't matter the car park, it's a car park) and there are certain assigned jetbridge gates for flights, I'm not entirely sure whether more jetbridges are required.
Naturally, if SYD is to grow on its current premises, then the answer is yes, they are running short.