IPL is enough to give practice for anyone because the T20 worldcup is scheduled to happen in Oct so if the rest is indeed for him then its okay. Surya Kumar Yadav being remains uncapped for very long time even though he showed his best in the IPL so its time for the selectors to give him some chance and continue the winning streak against one of the international t20 teams like Eng.
Well.. in a sense, that is true. Nowadays performance in the IPL is the primary criteria for selection in to the national team (in all the three formats). The problem for the selectors is that there are too few slots, and too many contenders. So eventually they need to drop some players, even if they perform really well. But it will be really disappointing for these players (such as Kishan and Yadav), if they are not selected.
BTW, I have one crazy suggestion for the T20 World Cup. Why can't the ICC allow two teams from India? One the regular Indian side captained by Virat Kohli, and the second a India A team (captained by someone like KL Rahul?). I checked the teams that are participating in the T20 World Cup. There are teams such as Oman, which are entirely comprised of expats from India and Pakistan (without a single Omani citizen). So what is the point here? Rather than allowing these expat teams, the ICC can instead allow India to field one more team in the World Cup.