As far as improvements go, I am not sure if we really need them. BTT is the kind of place which just keeps going on. Doesn't matter if it looks outdated or a bit spammy or without any shiny new features. New projects will keep launching and their subsequent Ann and bounty threads. New people will keep coming to the crypto world and one way or the other find and use BTT.
Unless, at one point people loose interest and everything goes to a halt 
It has happened before with other forums where there just wasn't enough interest from the owners to keep them alive.
I remember I was very active 10 years back on some web dev forums and they went dead after a few years of carelessness and bad decisions.
I've created a topic in Serious Discussions talking about some early signs here: Revitalizing the Local boards