Mobile World Congress is one of those events that have been mounting a comeback. It used to be the must be event during the smartphone revolution - where it was un-thinkable for any player not present a new phone in Barcelona.
MyPOV
Conferences come and go. Most of them never come back. MWC maybe on a come back with all the branching out into adjacent areas. IoT is functionally close and makes sense. But AI, ML, Cloud, PaaS not necessarily, unless you realize that MWC is really a platform event for ... Android. Mostly. Let's see what 2018 brings.
If you see me, flag me down, always happy to chat. See you in Barcelona.