Who are the parties that disagree about the 1MB or 2MB size? Are those the Core developers?
Bitcoin Core proposed SegWit and opposes increasing the block size limit.
The disagreement is exactly that: It is better work out all concerns that has been put forth as to how this is being implemented, than to try to push a change that many won't agree with. It is better to have one bitcoin, after all.
When people's only justification for opposing forks is that other people oppose them, I know that they have no idea what they're talking about.
The fixed 1MB size is history. Since last week segwit is activate on mainnet, which means the fixed max block size is replaced by a flexible limit of 1-4MB.
If I understand correctly, the concept of Segregated Witness is that it creates a new transaction format which segregates the witness data from the transaction in such a way that legacy nodes don't see it.
So there is still a 1MB max block size for legacy nodes, and therefore you could argue that the max block size remains 1MB - anything else is just about whether people decide to use the new SegWit transactions and run newer nodes.
They are different software projects than bitcoin, with a handful developers all on a single company's payroll.
OP - unless you have further questions, I'd suggest locking this thread to avoid opinionated and arguably ignorant information like this being posted.
so we will have 3 bitcoin in my wallet soon ?
No.