Sure, you can still buy the 2020 Nissan 370Z but why would you? Nissan just filed for a 400Z trademark application and is likely working on announcing this car sometime next year. Expect the Nissan 400Z to take styling cues from the old Datsun 240Z.
Technical specifications are still a mystery but rumors say this car will source a rear-wheel-drive setup from either the Infiniti Q50 or Q60. Fingers crossed they get it right.