Long term VSTO addin's support roadmap for MS Outlook

The New Outlook announced recently says it does not support VSTO add-in's (visit https://techcommunity.microsoft.com/t5/outlook-blog/things-to-know-about-the-new-outlook-for-windows/ba-p/3383964). Users wanting support for VSTO addin's are being advised to use classic Outlook. Is there any indication in terms of how long classic Outlook will be supported alongside New Outlook?
Also, is this setting a pattern for things to come? e.g. Might there be a version of New Word, New Excel on the horizon that will not support COM/VSTO add-ins and will have classic apps as counterparts?
There will be organisations similar to ours who have invested heavily in feature rich VSTO add-in's that cannot easily be ported across as web add-ins due to the feature gaps between the two stacks. It would be good to have an idea of what the roadmap looks like for COM/VSTO add-ins so organisations can plan accordingly.