It's more that that would send poor Chomper back to that island and wipe Ruby from existence that has me worried.
Do you hate Ruby so much that you'd want her gone?
There are already incidences where characters were brought in and then never mentioned again. Dil and Ichy are such examples. Rhett is another. Ozzy and Strut. RInkus and Sierra. Tickles. Dinah and Danah. From what I recall, after their only appearance, they are never mentioned again, nor does their existance seem to be acknowledged.
So what's the difference with not including Ruby and Chomper in the 14th movie? Unless you mean it takes place in an AU where certain events didn't happen (Ruby and Chomper never met, never went to the valley, etc). Of course, there's also the chance that the 14th movie won't include Ruby or Chomper because it takes place before they had even arrived.
But even if that is what happens (if they go the AU route), well so what? You have a whole TV series with them as major players. Does it really matter if they are ignored in the 14th movie? If they aren't even mentioned, you could just come up with your own ideas on where they were.
Not caring about the TV series does not equate to hating it or Ruby specifically. I personally don't care if they ignore the TV series or not because it's not something I consider important to me. I have other things to worry about, so I'm not going to get worked up over a TV show. However, I don't hate the show, nor do I hate Ruby. It is possible to not worry about the TV series being ignored and not hating it. In fact, it's entirely possible to like the TV show and still not care if it remained canon or not.