Do anyone know if there is coming a game night kit?

For how many players is one kit for? Is there only one playmat and one of each nightmare deck?

It really varies. I've seen an Heirs of Númenor kit on Amazon that contains one playmat, one Boromir poster and one copy each of nightmare scenarios for the first Hobbit box. I think I've also seen Black Riders kits with 4-5 playmats and as many special copies of the special edition Aragorn.

As of now, I don't think these kits are released to the public (or rather, not for reasonable prices) but meant for those who attend conventions and game nights.

The Fellowship event had 4 of each in the box. Im curious about are there going to be in the future a game night kit and what it contains (amount), so I could ask the gamestore to hold an event.

Game Night Kits are no more, but there should be another event kit this Fall similar to the Fellowship event.

I feared that when I saw theres no LotR in the Organized play page

The last Fellowship event was amazing. I did like the Game Night kits also, and personally wish that there was some sort of cool Race Against the Shadow official tournament events, but I am happy that the Fellowship events take place at least.

Is stopping these a sign that support/content for LOTR is slowing?? Should we be worried??

Nope. The OP kits are for the competitive games. I'm betting the demand for these kits was so low to not be worth the effort. The Fellowship events were well done, if a bit expensive.

Judging by the release rate of the saga expansions, LotR should stick around for a while longer. As far as we know, with the release of The Treason of Saruman, we're only halfway to Mordor.