Wow! Fifty to a hundreds years into time; their will be no written history of todays events.
There's more video, written, photo history than ever before. There are various archival projects, and additional physical objects like DVD/BluRay, current books and more. Much of the ephemera is also saved sort of a side effect of all the spying from governments, advertisers, etc. I imagine we'll continue to have even better and clearer history as time goes on - or at least I'll take that bet. Look at what we have about the various gulf wars for instance. What started with newsreels in WW2 has become videos all over the place during the 20 years of the Iraq war.
Just think if the founding fathers of the United States did not write the constitution for our generation to read?
Nothing I said implied that we won't write things down. Laws, court decisions, heck plenty more is written down today, and broadcast over the entire internet on Facebook, X, TikTok, Reddit and more. I think congressional stuff is even printed out on the regular. I don't know why you would think something like a constitution would be in the same category as a random personal letter? I don't think hand writing it helped (I think they had professional scribes do it / make copies), it was just the tech they had at the time.
On to the more philosophical - it being written down was important, but it being on an official web site or official printing, or cryptographically signed PDF etc would be as useful IMO. That all said, it's not like it's all of that easy to read either. We have whole specialties on interpreting it and different schools of thought that compete. Historical documents always need interpretation - especially as they get centuries old. Language changes, context is lost, meanings of words and phrases change or are lost to common culture.