There is an updated version to Streams here:
https://saqimtiaz.github.io/sq-tw/streams.htmlThe one you linked above, I believe, was his first prototype. Of course, even this one is still a beta of sorts, and I would recommend playing with it in a second wiki or at least backing up your data prior to working with it. I've been using it for a couple of months now, though, with no issues.
I do believe you will lose the structure if you deleted the plugin, but that is perhaps a question for Saq. I'm a rather non-technical user who has only begun my journey with TiddlyWiki, and I'm still learning those things myself! I believe there are options within Streams (check out the newest version) that allow you to change naming conventions. In other words, it could automatically name them off the first line of text, or you could change to some other form of Zettlekasten naming convention.
And yes, merely dragging the plugin onto an existing TiddlyWiki will do the trick.
I have found that it works best if you also install the Stories plugin by Saq as well. They're not dependent upon one another, but the Stories plugin allows for a two column story river. It makes working with references and Streams into a very fun, drag and drop experience.
You can find stories here:
https://giffmex.org/stroll/stroll.html#%24%3A%2Fplugins%2Fsq%2FStoriesWhat results are two, side-by-side story rivers that allow you create outlines in both. I will open my "source" tiddlers on one side with all of their literature notes I've made. And I will open the article outline I'm working on in the other side. This allows me to simply drag and drop my notes into the appropriate place in the outline. And, since I have already tagged them all with a footnote using the Refnotes plugin, that information goes with it.
The results are like this:
