Once you've met the requirements and have achieved the certification, it's yours for life.
I understand that any VCP certification is valid for 2 years. Does change this with VCP-DCV 2019?
Other point, achieving VCP-DCV 6.5 Exam 2v0-622 will automatically entittle to VCP-DCV 2019, right?
There is no more recertification: VMware Certification: Recertification Is Changing and What It Means to You - VMware Education Services
There's an FAQ document linked from that page which answers your other questions.
Thanks Scott, great news !!