I would not expect it to be an issue. 2019-nCoV is, contrary to the clickbait buzzy news stories, not nearly as dangerous or contagious as was originally reported. The only deaths currently have been from those who already had weakened immune systems. That being said, if it does become a bigger issue,
- The RECF technically has the power to prevent any Chinese teams from visiting worlds. As far as I know, the RECF gets visas for Chinese students along with their worlds invites. No invite (their choice), no visa, no being at worlds.
- In the unlikely event that the RECF would have to do this, conditions would have to be so bad that the US or Chinese government would have instituted travel restrictions to these extremes of their own.
The virus has so much media attention right now because it is new, and gets clicks. I would not worry.
TL;DR: Nothing to worry about, China will be going to worlds just fine.