In the past, it's been said that Wix has shitty SEO, so they tackled it head on and improved it several levels of magnitude.
Putting aside the performance issues for a moment, I think WixCode introduces a lot of potential for web designers and coders alike. There are a lot of benefits, including cloud hosting, DDoS protection, impressive applications market, etc... All with zero code and no headache. I would love that peace of mind back in the days.
Now, they're taking on the developer market, which is a very demanding crowd. I hope they can live up to the high standards.
Bottom line, I wouldn't rush to decide on the fate of this product just yet.
On the other hand, I've been known to be overoptimistic, so...