A word processor which supports the same style options as Google Docs and used pandoc to import/export would be as much as most users need.
That said, I'd really like to see an office suite put together out of the various opensource tools which try to approach documents/graphics in new and striking ways:
- LyX --- a "What You See Is What You Mean" document processor, it can offer quite professional capabilities (when I was doing STEM composition, the book which came in as LaTeX exported from LyX was the cleanest and most straight-forward manuscript I ever worked on)
- PySpread --- (or maybe Flexisheet if someone can get it to a usable state) Way more than most folks need, this Pythonic spreadsheet where every cell can be either a Python program or the output of a Python program could revolutionize what folks do w/ spreadsheets and data
- Jupyter Notebooks --- almost a de facto standard, getting wider adoption would be a good thing
- ipe --- https://ipe.otfried.org/ --- this, or TikzEdit or maybe xasy for Asymptote would be more drawing tool than most users would ever want, and able to make anything anyone really needs