Here is my view: keep in mind that I do not actually own a Redi cube, but have tried one before.
Many fast people of this puzzle average about 10-12 seconds. This puzzle has not even been out for a year. If this were to actually become an event, I have no doubt that people will become sub-8 very quickly. This ranks the puzzle similar in time to events like clock and Skewb. This also means that WR single will come down to luck, and in my opinion, we should not have another semi-luck based event.
Some may argue that that is the reason for average, and I do agree that average shows better skills, but with such a quickly paced solve, I foresee the single and average WRs to plateau in times quite quickly. We are seeing WRs improving by fractions of a second in many events, and in my opinion, if the WCA were to add another event, it should take a bit longer to solve, so there would be a lot of room for improvement timewise. I personally enjoy seeing WRs change by multiple seconds instead of fractions of second (e.g. 5x5 single compared to pyraminx single)
With that said, I don't believe that the WCA should add another event. With the growing population of the Cubing community, and multiple rounds in competition for each event, major competitions will probably end up being a week long. I really support the idea of competitions holding it unofficially, but I do believe that it should stay out of official rankings.