If you have chosen to become a Tableau developer then you are on the right path. Because if you will look at the current market situations, then you will find Tableau has a very good career. But the future of anything can not be predicted the future of Tableau as it is just a visualization tool and there might be a chance that many more tools can come in the future and they might replace Tableau, but for now and in further 3-5 years Tableau is not going anywhere. For becoming a successful Tableau developer you must add some more skills in addition to Tableau will give you good career growth like R, Python, Predictive analytics, etc. I am also mentioning a video tutorial for you which you must watch to learn more about Tableau.