It is also fairly obvious that not one of the Tanaim, Amaraim, or Rishonim used electricity. The reason for this is also fairly obvious; in that day and age, it simply wasn’t possible. It also wasn’t possible to survive without going to work, so they worked. But today, if one is learning and can survive without working, why work?
What is likely going to happen if the Charedim are drafted but refuse to go, is not Jail term, There is no way Israel will jail 100,000 Charedim who refuse to go to the Army, However Benefits will be cut off. Meaning you will have no source of income. Poverty will be even worse than it is now. Children will starve.
Emigrating to the US wont help that, In the US they are cutting benefits too.