As a "little developer", I don't really know what's exactly going on behind the scenes - business stuff is not so my big thing.
However, I feel that it would be good for MySQL to have its own full featured storage engine(s) (with foreign key constraints, ACID transaction and all that stuff) under its control. Maybe there are no risks for the short term (I don't know), but it would still be better for MySQL's reputation to be completely independent from any competitor and from anybody else.
Insecure users will more likely migrate to another database systems than those who know what the future will bring. And people who now use other database systems will more likely not migrate to MySQL, if they can't anticipate how data will be stored in the future. So I would see an own and independent full featured storage engines as one of the very highest priorities for MySQL's future - not only from the technical point of view, but also for MySQL's reputation.