I’m personally an Emacs Speaks Statistics fan myself, but RStudio has been huge boon to the R community. I expect that this will go a long ways towards making Python more accessible to R users.

More importantly, I hope it makes the RNotebook model more popular with the Python crowd. I still do not love Jupyter’s notebook model (Joel Grus sums up most of my arguments—though my biggest beef is with revision control troubles). IMO Org-mode and RNotebooks have the right idea of being text with code interspersed, rather than the other way around.

Lastly, I think RStudio support for Julia could go a long ways toward enriching that ecosystem. Julia seems to be mutually acceptable to R and Python users, but better thought out than either.