I don't see a problem with continuing releasing 1.26 worlds once in a few months.
The reason is because most players prefer playing 1.26 and it is only fair that new 1.26 worlds should be released for them. I don't see any problems because 2.0 worlds will also still be released to make other players happy that prefer to play 2.0 worlds.
I am going to Vote yes for this, Even if I don't like 1.26 worlds because I know other players of the grepolis community would prefer 1.26 worlds and its only fair.