For sure, we'll use both. They both will continue to get used a lot. Probably AI will get seen more, but web will stay around a while, since its good for looking things up, and playing games in as an example.
Both are perspective. You should choose according to your own interests though. You gonna make a good money in whatever field you master and you are more likely to succeed in something you hold great interest in.
AI for sure. People already taught an AI to make a game and they showed the AI pictures of mega man and other stuff and it made a game similar to mega man. So in the future people could use AI to make webs and web design.
Already AI is no longer one field. There are AI programs which program AI themselves. There is Machine Learning, Data Visualization, PyTorch R and TensorFlow, Data Science, NLP, plus a WHOLE bunch of other AI "fields" developing each having their own specialization so AI is already too broad of a topic in many practical applications.
it dosen't matter at all ... which one "you could be great at it" is your challenge ... what ever you learn you should able to do impossible with your passion But step by step .. and it will take time to achieve that level ... so JUST don't waste your time.