Although most want us to finally get a new forum given how long it has been since it was announced that they are working on it, I do not believe that the new forum will have an impact on the quality of content and the improvements that would go in that direction.
It takes longer time than expected but theymos said 2 years ago that the new forum software is mostly finished. Just a bit more improvement and testing as well as data transition. The most important part is data transition and testing of the new forum software.
I know there are months forum members were hyped with new forum software set up and testing but in latest months (~ more than 1 year), it is almost disappeared. I am not sure why but it does not help for a launch of the new forum software.
New generations are looking for something modern, with countless options of which they will not use even 10%, and if someone says they will not use the forum because they do not have a mobile view or it does not look like FB or some other social network - then it is clear that they are not here because they want to learn something or share experiences, but for some other reasons.
I totally agree. The most importance is why they joined the forum and what they are looking for in the forum. UI is just a bit minus or plus point among other factors.
Honestly, I visited some testing forums based on a new forum software and I don't like its UI. I am not sure how do old forum members feel about it? Have you ever visited such testing forums? If yes, what do you feel?