If you had consensus to make whatever changes you saw fit in Bitcoin right now with a hard fork and the community was 100% behind you, what changes would you make? What improvements do you think Bitcoin needs through a hard fork?
None.
Current state of Bitcoin is perfect because its stable and that is most important.
We need more privacy but i wouldn't push it now, because privacy solution is not ready to be included in Bitcoin code.
If it will be, and will be tested to pain treshold, we will have it.
Bitcoin development way is slow, but it needs to be slow to hold value.