Wouldn't Oracle need those 80%+ devs if they wanted to shift their efforts into Heatwave? That percentage sounds too huge to me and if true I believe they won't be making any larger investments into Heatwave neither. There's several core teams in MySQL and if you let those people go ... I don't know, I am not sure what to make out of it but that Oracle is completely moving away from MySQL as a strategic component of their business.