I don't think (most) guys must migrate from other RDBM, normally they select mysql/mariadb/webscale/etcetc before starting the project, a migration "in the middle" of a project is costly.
I agree, there's many open issue at jira/mysql bug report/percona/etc/etc and others issue tracker systems that being completed make users migrate to mysql

2016-10-14 10:21 GMT-03:00 Richard Bensley <richardbensley@gmail.com>:
Is anyone surprised by the lack of TokuDB support? Percona is primarily an Oracle MySQL fork . The InnoDB changes in MySQL 8 represent something entirely different. Good, but different.

I don't think I am being too speculative when I say, I am sure Oracle are in no hurry to make MySQL a serious contender to Oracle just yet! But MariaDB could.

Me and many others had hope that TokuDB would be the death of InnoDB in MariaDB, and the catalyst to a truly amazing open source database.

RocksDB can still come into play later, but it's not going to help users migrate from other RDBM systems, fix existing "missing" features from MariaDB, nor is it anything I don't think, existing TokuDB users care about. 

Richard

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Roberto Spadim
SPAEmpresarial - Software ERP
Eng. Automação e Controle