The ticker will disappear, as with any deleted by FINRA. If the brokers are paying attention to the Daily List, as they should be, they'll have seen the notice on Friday, and will be prepared. Of course some will probably miss it initially.
I wrote to OTCMarkets late yesterday, bringing it to their attention. Let's hope they're on top of it, or a lot of confusion may result.
I'm not sure what happens in shareholders' accounts when tickers are deleted. Especially for this reason. When registration is revoked and the ticker disappears, there's often still a company, and stockholders still own stock in it. But with KEYO, there is no company...