I'm thinking of France here, which has something called the 'Academie Francaise' (apologies for butchering the c-cedille in this context, the accent aigu 'e' in cedille and acedemie). The only effect this seems to have had is some token re-inforcement of French as a 'world language', but in practice it became a 'come up with French words for words where we already have a perfectly good one that everybody the world over understands but which isn't French'.
If that's culture then I'd much more concentrate on the content than on the form and remove these artificial barriers. Which of course will lead to more and bloodier wars ;)
Unicode is great, it made all languages equal. But I don't see the point of artificially making the problem worse by introducing new glyphs, that's the wrong message to send. We should aim for simplification within limits (not to go down to carricature) and if German got by so far without the 'capital sharp S' I see absolutely no reason to introduce it in the modern age. It's a step back, a small one, but still.
Now, emoji, OTOH, just feels to me like unnecessarily polluting the character space. I'd much rather have a capital ß in the codespace than some smiling poo family.
[1] http://www.unicode.org/L2/L2015/15327r-n4704-medieval-punct....
However, I think it is important to note that the ẞ is not a letter they just made up. Heck, even the picture in the article shows an old book cover, which uses this never standardized letter. To me this is just correcting a previous oversight and formally allowing (not forcing) people to use the 'capital sharp s', for example in print, where they want to typeset a title in capitals.
For sorting there is standard (DIN 5007). Replacing ß with ss is correct (even in the lower case variant). The other letters are more fun: ä is replaced with a for sorting, except if you sort a list of names. In that case you need to replace it by ae. Probably not something international software is aware of. The Austrian sorting of names is different and other languages that have the same glyph (e.g. Swedish) also have other rules (e.g. by placing ä at the very end of the alphabet).
Collation rules that vary by locale exist for this reason, and all major programming languages and OS'es support this. Of course whether the software you use does this or not depends on the developers writing the software.
Actually, German has the Council of the German Language, which is what did this standardization effort of the new ẞ
But there's something to be said for preserving a few aspects of the diversity of cultures, as each one acts as its own preserve of centuries of wisdom. Hey, it's the German language that gave you Uber (the name). Which should actually be Über, but I digress. (and it'll be Over soon enough, anyway).
We've come a long way with making unicode universally available, and there's really no reason to give up now when it's almost done. It's not a big issue for German, but cultures with non-latin script would rightfully be offended if forced to abandon it for ASCII, in the same way that the world would be poorer if all restaurants were replaced by McDonald's.