Yes the rumor states the plans are until star wars land opens in 2019. Most probably D23 Expo 2019 it will be announced...
"The rumor" doesn't "state" anything. People state things. Don't set up this entity "rumor" as a source. People are sources.
You are quoting from the YouTube channel DSNY. He is your source. And he's not really a source. He knows **nothing**. He is repeating what other people say. He has no personal inside connections to Disney. You can't even say if he's reliable, because there is nothing there to be reliable about. He's just a rumor aggregator posing as "news."
I know what he's doing because I'm a rumor aggregator, too. See this post: http://forums.wdwmagic.com/threads/rumor-and-upcoming-timeline-tracker.926402/
The difference between me and him, besides the fact I'm not profiting from repeating other people's blogs, is that I only report the rumors from reliable sources. And even then, I'll pit one source's information against another's because things change. And they change often. And I point out when a rumor is really weak or if there are several insiders all saying the same thing.
So, again, Monstropolis has been a running idea for a long time. So when some other site says it's being considered, it's true and it's not true. It got passed over by Toy Story Land. This means Monstropolis is off the table and if it were ever to happen, it most likely won't be reconsidered until after 2020. And even then, it's not like it's is "up next". It is still a possibility, a very slim one. And who know what big IP will come long in the meantime to keep it out of consideration. I get this from the many insiders here in these forums. See the rumor aggregator.
There isn't a 'rumor' that Monstropolis is coming, there are people wrongly saying it's coming.