Signing Vuc would be sacrificing the future.
It is in our best interests to preserve our long term cap space, because we will very probably not be a great team next year due to the number of young and developing prospects we will have on the roster. It's much more sensible, in my view, to wait until the 2021 free agency in two years when a bunch of huge names come up and we can have cap space to throw at names which we know will fit, because by then we will know who is sticking around. We'll know, at that point, whether Ingram has worked out in New Orleans, and whether Ball has patched up his game, etc. We will know which positions are of need, which is an important thing to know when you're signing big money, long term deals.
The only way to ensure that we have that cap space in 2021 is to avoid signing big, long term deals now, especially to players whose market is a little inflated by the amount of cap space floating around. Vucevic will be demanding a 3 or 4 year max. We should definitely NOT be offering that, and if we do, we sacrifice that future flexibility and cap space when it's more useful and more informed.