This is just the usual political games being played by the nationalist parties in Bosnia. The country is paralysed because of the shortcomings of Dayton (and there are many!), and each ethnic group keeps electing the same nationalist parties, which in turn operate a very cosy system of patronage. Dodik in the Republika Srpska is simply playing to his domestic audience to cover up the failings of his government, just as (Bakir) Izetbegović does with the Bosniak SDA and Dragan Čović does with the Croat HDZ.
Without going into too much tedious detail, Bosnia is essentially a three party state where each party pretends to argue with the other two so that they distract voters from the corrupt nature of their parties. No-one has anything to gain from war or secession, and the Dayton formula essentially ensures that these parties will rule over Bosnia until Dayton is either repealed or people finally realise that they're being taken for fools.
To give an example: in Sarajevo, you need to be a member of the SDA to have a shot at a government job. There's not much in the way of meaningful private enterprise, so a young Bosniak has to join the youth wing of the SDA. They'll hand out leaflets, they'll carry out political work, and then they've got a path into the SDA itself. SDA membership at university then becomes a path into getting a job in a SDA-controlled company or institution. Even in private companies, you'll find that the owners are linked to the SDA, so it becomes a kind of vicious circle in which the family votes for the SDA simply to protect the position of their family member. So, in this case, Dodik of the SNSD operates exactly the same system. There are elections coming soon in Bosnia (next October, if I'm not mistaken), and so Dodik is simply making sure that he'll get re-elected by proposing things that are popular in the Republika Srpska.
What's needed in Bosnia is for the international community to sit down and abolish Dayton. BiH is a failed state on many levels, as witnessed by the fact that Mostar went for years and years without an elected mayor. It's explained here in more detail -
https://en.wikipedia.org/wiki/Ljubo_Bešlić - but essentially, the HDZ and SDA in Mostar had nothing to gain by holding elections there. It was better for them to maintain the status quo, as they each held power over their respective half of Mostar, including appointing people to various well paid positions.
The problem is: it's unlikely that any of the Bosnian political leaders would agree to abolish Dayton. The system guarantees a Bosniak, a Serb and a Croat President, which effectively rules out any other ethnic minority from becoming one of the collective Presidents. As a result, without being too cynical, perhaps it actually would be better if the Republika Srpska left BiH. The remaining Bosniak-Croat Federation could then be reformed into a normal state with some minority rights to protect the Croat minority, which would also end the dominance of the SDA in the affairs of the existing FBiH.
Unfortunately, the international community doesn't want to hear about independence of the RS. It's a bad move for long term peace, because the RS simply doesn't want to be part of BiH. They don't want war (they remember what happened last time, and they know fine well that they were within 2-3 t weeks of completely losing the Republika Srpska had the Bosnian Army been allowed to go for Banja Luka), but they don't want to stay in BiH as well. Letting the Republika Srpska go their own way wouldn't be very problematic, and it would be possible to make it clear to Serbia that any concept of Greater Serbia is not on the table.
(it's also worth reading about the Brcko District, which works very well -
https://en.wikipedia.org/wiki/Brčko_District)
But yes, talk of war is just silly. No-one wants war there, and unlike in 1991-1992, the RS forces don't have access to large amounts of artillery and other heavy equipment.