I finally think I need to suggest you Steinberg to get VST2 support dropped in Cubase 10 / Nuendo 9 or further releases. (I changed the version number expected since it looks still too early for Cubase 9 / Nuendo 8)
The reasons were referrable from these threads:
Continuing support VST2 equals to continuously spoiling these manufacturers. This is the reason why they never give VST3 a **** for at least 5 years (I forgot when did VST3 come out).
Also, continuous support of VST2 is something similar to VSTBridge (a burden to Cubase / Nuendo development team).
If some people need VST2, just let them stay with old versions of Cubase / Nuendo because they are more likely to hesitate to upgrade their operating systems (making them one less reason to use new version of Cubase / Nuendo).