Hate or not, realpolitik will rule the roost. Survival will become supreme for BD, not ideology.
The thing is most people just care about roti, kapda and makaan. So the more they spend on useless ventures like the military, the less likely they are to retain power.
Furthermore, the Islamists don't trust BD's military. That's the same problem PA is facing in Pakistan. And at the same time they do not want to repeat the mistakes PA did in dealing with the radicals post the Lal Qila incident and the Islamists don't want to make the BD army more powerful than it already is.
Realpolitik comes into play when there are established parties engaged with each other. Like Haseena and Indian govt. Realpolitik doesn't come into play with an interim govt backed by an islamist.
Tell me why hindus were targeted once haseena was out of power ? There is no realpolitik at work here. hindu women getting raped, young women being kidnapped, hindus forced to cut off hindu symbols from their bodies, hindu houses being burnt, jamat - e islami converting hindus. This is no realpolitik. They simply equate hindus with india. They hate India and they hate hindus as kafirs.
They will get less roti, less kapra or less makan, but the BD islamists have the need to be in power. dictating terms to the BD govt. This is South asian islamism, bro. No realpolitik.
I don't know where you got the idea that the islamists don't trust BD' military. Do you know how the coup became successful ? BD military refused to shoot protesters when Sheikh Haseena ordered BD military to shoot at them. Those protesters who were backed by bangladeshi islamist parties. islamists are in hands with BD military here. they don't care about realpolitik.
Pakistan is different from bangladesh. the only thing that connects them is islamism. PA and BD Army are different entities. BD military is going to be in power with the help of islamists in bangladesh. it's the beginning of a new era for india-BD relationship.
More than all that, what we need to do is turn the BD border into a fortress a la Pakistan to stop unchecked migration.
That is the key but the terrain with rivers, riverine and water bodies at the border, the task is humongous.