A major core code update would require a new hard fork, something that in this phase would not help us for a certain direction.
We run the safest/bug free version of Zec , with the right equihash alternative choice in order to stay ASIC resistant.
If we see that a newer zec core is bug-free , or if we need a new asic shielding alternative or if we take a decision for reducing the block time for a speed upgrade , we could discuss a major upgrade for those cases.
However in this phase is not a must-have. Maybe in a couple of months / btw the VaultZ could contribute in keeping a better pace in such major upgrades.
PS : we should not underestimate the power of the social media.
The most coins out there are open source copies of each other. Their differences are 1)the extra features built around them by their members (variety of wallets , extra apps etc) , 2)their extra deals with exchanges /sellers accepting them and of course their 3)fundamental rules and philosophy (rewarding structure PoW or PoS , premine or not etc).
BtcZ has a very special character and has made an excellent job in (1) and (3) but it needs more push in the (2) imho.
And this can be achieved only by making known the (1)&(3) to the people in order to make the coin recognizable and well adopted.
So yes , twitter/fb/reddit etc can make the difference and every other promo action as well.