As you can see the 18 men squad, already 4 openers are sitting there (KL Rahul, Rohit, Sikhar, Gill). Hard to add another opener in the squad, competition is tough but Prithvi Shaw/Devdutt Padikkal time will come as Sikhar Dhawan seems to losing his charm nowadays. They will move up to the ranks anyway in the next 2-3 years.
Shikhar Dhawan is well past his prime. If he doesn't perform in the next 2-3 outings, then he should be dropped from the squad and sent back to his domestic team (Delhi). Devdutt deserves a chance now, after performing consistently with the bat over the last two years. Almost everyone else have got a chance, including Shaw, Gill, Kishan and Surya. So I don't know why Devdutt is getting overlooked.
I doubt if he's going to feature in domestic regularly. Delhi already dropped him after couple of games in Vijay hazare trophy, if something goes wrong with his fitness or form for long then he should stick with the T-20 format (IPL) and try to comeback. Devdutt is 20 years old so nothing to worry about as he has plenty of time. He's left hander opener so in future he will come easily in the team if he continues with his form.