I think segwit is plan to fix slow transaction and high fees from developers,
unfortunately it is not activated because there are some people ( what I know the miners )
who disagree with activation of segwit and they won't update the software.
So we must wait and see other solution and what is the best can be accepted
by all of comunity of bitcoin until this problem finish.
why some people disagree it?
fast transaction and low fee will bring more people to use it
Some people usually the miners, they are disagree with segwit because
if it be activated bitcoin will become like fiat money the government or corporations
can be control the bitcoin and the other reason bitcoin's network will be down.