Not everything needs new molds though. They could have made like 10 more lines of Steck castles without having to use much new molds at all.
Could have just done some different colours, maybe use the big pointed roof from the Museum in a castle too, or the double arch also from the Museum.
By now there sure are plenty of molds for medieval weapons, shields, armour, hats and such too. Can experiment with new colours, bring older helmet designs back, etc.
Main thing that I think could use a new mold would be on pirate ships, and not like the garbage design of the newest pirate ship that lacks a cabin. Last time they released a ship without a cabin was the fastest time we saw another pirate ship released after that, old reliable once more.
I'm personally pretty tired of the oldest pirate ship design. I personally like the 5135 pirate ship the best, the one that came with the huge treasure island batch.
Only big pirate ship I own too. It's slightly bigger and just has a way better shape to it, and I prefer it's colours over the earlier 3286 of the same shape.
They could still use this design more often. It's only been used twice while if I am counting correctly, the first design has been used seven times.
Might also be nice to see smaller ships with a cabin, or maybe like a Spanish type galleon that has a cabin at the back but also a smaller cabin in the front. and seriously, the soldiers should get the big ship for once.
Could also be nice to have a big ship with a more open deck where you can actually place four cannons below deck through gun ports. Wouldn't be weird if the ship comes with only two cannons and two more come from other sets, since the cannons could be moved to the other side. Only tend to fire from one side after all.
Could also be neat if a ship was actually designed to hold the big mortar gun at the front of the ship, instead of just having a mortar while it does not really fit anywhere on the ship.