I guess I can't really say. I think they wouldn't really feel like a whole world full of the same person. Like, even just Me At Different Points In My Life feels like totally different people. Me At 31 would struggle not to get into an argument with Me At 15 just because of how staggeringly different our worldviews and experiences are.
There are probably some of the me's who can't do their jobs. I'm not very physically fit at all, so I assume a lot of things that are done by via muscle would need to quickly gain mechanical assistance. Some me's would be in jobs that make them miserable.
Do different cultures still exist -- do the me's grow up differently? Is there a version of me that grew up in China, or do we all have the same US American backstory? Do the male-bodied versions of me have memories of growing up as a boy, or are they just suddenly in the "wrong body?" If there are no differences like that, then that's a powerful narrowing of perspective that doesn't seem like it could be good for the world in any sense.
Some me's might try to save as much of the old world as they could. I think I would recognise the importance of preserving lost cultures. But it would still be catastrophic -- for all practical intents and purposes, thousands of people groups would be wiped out. Entire languages would die as their sole remaining speakers were replaced with my english and 2 years of highschool latin. Stories and memories and oral histories that hadn't been written down would be lost completely.
But I guess it won't much matter. Even if some of the child me's end up different from me and wanting children due to differences in how they grow up in the following years, I'm pretty sure none of us can procreate healthily because, as clones, we're basically all very related. So. The population will die out pretty fast.
It'll be a sudden, huge erasure of culture and a significant need for mechanisation in physical labour, followed by the death of humanity -- things like "hey, maybe we can all draw" or "we'll all have a very specific mental disorder" might impact the culture that briefly develops over the course of a generation, but compared to those other things, they seem sort of insignificant.
