Also arguing change limit to 2MB (or 4MB) means number of nodes have to decrease considerably is wrong, there is scientistic study I saw recently it might decrease the node count by up to 10% - you will not notice such small change on decentralization (btw thanks to Bitcoin Classic we are already up by 30% in 1-2 months)
You just defeated your own argument. As far as Classic nodes are concerned, they are worthless and part of a Sybil attack. Read:
A date with Sybil.
1) with 2MB (or 4MB), nothing changes much here
2) second layer (LN) does not even exist currently, so pointless to argue whether LN become decentralized or can be used only in centralized maner as seems today
It does actually. In a small amount of time you will have people asking for 6 or 8 MB, that's for sure. It is not pointless to argue about LN. LN is being designed so that it is decentralized, don't spread misinformation that it will be centralized when that is not the case.