If the tools remain easy to port games and enhance them, this will be a great addition to the competitive nature of the console market in general.
My opinion as an owner of all major consoles/PC:
With one of the best controllers in the market today, an OS that is constantly getting updated and faster, backwards compatibility built-in diversifying your library and what looks like now more impressive hardware to give developers a way to show off their games in remarkable/amazing ways, linked with cross-play games for consumers that use it for gaming across two different platforms - all this should build consumer confidence in the XBOX brand in general, which has been lacking since Don "I murder products" Mattrick almost buried it in the landfill with all the ET cartridges.
I'm very glad Sony, Microsoft and Nintendo are each succeeding positively in different ways. Great for us, great for business and great for competition. E3 is going to be a blast either way you look at it.