I am surprised that people are writing off Pandya already. He has the basic skill set of becoming a good all rounder in ODIs.
He can bowl 10 overs. Can be a tad bit expensive, but hopefully he can add some variations and in the long run bowl 10 overs without conceding too many and picking up a lucky wicket or two in the middle.
He can hit the ball, and seems to have a brain and the never say attitude. He just needs to improve his technique slightly, and can fulfil the role of a hard hitting no.7 and finisher.
Most importantly, the kid seems to have the temperament and the fighting attitude which makes him so valuable.
Will he become the next Kapil Dev? No
Will he be a test all rounder? No
But if he can improve that little bit, he could take become a game changer for India in terms of the balance it would allow the Indian team. He will not become that player by champions trophy next year. But if he works on the small issues and gets the faith from the team management, come 2019 WC in England, he could make a huge difference for India.
As for his brother. I dont follow the IPL so I dont know how good he is. But India has always been blessed decent spin all rounders. Or batsmen who can ball a few of overs in LOIs, or spinners who can bat. Yuvraj, Sachin, Ashwin, Jadeja, Raina, Sehwag. Even Kumble and Harbhajan were no mugs with the bat and have won India matches due to their lower order batting. But finding a good medium pace all rounder has been next to impossible. Thats why, I believe Hardik Pandya should be persisted with.