For that reason, for the best understanding of language situation in Mesolithic Europe, is using known analogies of other hunter gatherers, like American Natives. Let's compare apples to apples.
It cannot be done, because this are totally different kind of languages.
Evey tipe of languages are evolving different.
Btw, indian languages are still possible to grouping. Many of them
are probably only on a level of dialects, which are called languages.
According to you - they couldn't be recognizable after... 3000 years?
btw 2 - in XV century, in whole Americas were only about 156 tribes,
which were separated by your point of view from 12 or 40.000 years!
Since the times R1-tribe to R1a+R1b-tribe were much less time.
By old datings it was 1000-3000 years. By new less than time
from PIE to us - less, because R1, divided on two haplotypes
must at the beginning coegsist by some time. Of course, after
that could exist different dialects, I didn't deny that, but finally
they were replaced by one of them.
And now read agian this exaples which I gave you, maybe now you get it.
If you believe that human race is 10,000 years old, I assume you believe that there was one original language 10k years ago, which first people spoke. Right?
You also believe in very slow evolution of languages. In this case how can you explain existence of few completely different language families, hundreds of languages, and thousands of dialects? All in scale of 10k years.
It depends on point of view. From the christian (or rather biblical) point of view, there wasn't one language.
At the begining were many totaly different languages which every one belong to only one patriarchal group.
I would say there was about 20-40 of them, becasue more or less like this we can recreate language families,
anthropological types and haplogroups. From this point, every language family can be explain by science and
natural evolution of languages. Even if you don't belive in christian book, you must admit, that in this case,
this book was right. Scientists were beliving through many many decades, that this is nonsens, because
people are mixing, there was no paternal superfathers combined which pralanguages - this was a myth.
Some of them are still beliving, that there was no one common language, because every language family
was evolving separetly - so, you do not have reliable source on that case.
And this is the reason, why Y's are so helpfull to recreate history and aspecially ancient tribes, and mt's are not.