The concept of long term kollel is practically non existent by most chassidim. If the litvishe went out to work shana rishona the whole support issue would be moot. Our system prioritizes learning and kollel. Hence the support issue.
You need to get out more. The concept of longer Kollel is VERY prevalent amongst chassidim nowedays, just take a look at the numerous packed kollelim all over in all kehillos/chassidos, first few years in kollel is basically the norm for every good learning boy and not only for the big Lomdim. Even parental support for the kollel couple is very common.
The distinction lies with the fact that amongst chassidim there is no across the board - almost mandatory system that parents must support their married children, let alone of having that burden assigned solely to the girls side. The wife's salary with his kollel checks (not just after 3 years and more than $300 per month) together with whatever the parents throw in keeps them going. Usually if there is a wealthier parent he will take that burden (I should say Zchiya) upon himself. Then there is those real wealthy ones who who will commit themselves for full support plus an apartment etc. in order to get that top boy but that is by no means the standard, nor does it create a system for the middle class to follow.
Honestly, it's to the Litvaks credit that chassidim copied their Kolel model and it is very commendable, but I see it as positive that they did not incorporate the mandatory girl's side support system.