Yes, football is like that, but if there's no guarantee, if I a football players, I'd rather stay in my previous country with a better league. Of course, this isn't what players who are dropped from the national team want. But if they was youn enough, maybe they need to get the opportunity to play for the U-23 team, even if it wasn't for the senior national team, it will be better, but the case is not like that, those who have been removed from the senior team don't have another chance. I think this is disrespectful to the players. However, coaches and officials won't think that far ahead, because the target must be achievable, no matter what will happens to players.
I don't think it's a matter of disrespect for the players, but rather a matter of eligibility. It's impossible for them to remain in the starting lineup if their performance is mediocre. Regardless, their performance is also taken into consideration. If it were mediocre, it would have been better for them not to have received an offer to play for the Indonesian national team in the first place. Also, being removed from the national team doesn't mean their football career is over. They can play in Liga 1 or try their luck in a foreign league. If they're worthy, they should be able to get an offer.