A drummer always would have work as there would be always people who would want a real drummer.
Firstly, we're not taking about industrial development, we are talking about art and creativity. Most artists (in all forms) struggle to survive until their art is discovered, appreciated and commercialised. If you vastly limit the commercialisation then most artists will stop creating because they can't feed themselves or pay rent etc. None of that is 'good'.
Secondly I am talking here from experience...
Yes, in the 80's when realistic sounding drum machines came along, the work available for drummers dropped off dramatically.
In the 2000's after software drummer tools came along, studio work for real drummers practically stopped. So we all switched to live work.
That's gonna impact your life and health. Travelling 11months of the year, living out of a suitcase, eating bad food etc. To keep costs down, most musicians now live and sleep on busses.
If real musicians are replaced by AI on all of the streaming platforms, how are these fake bands going to tour. There is no artist, there is no lead singer. They are a low cost product, so they don't need to play live today their bills.
This is a warning to music fans. If you want to see great music played by great musicians you need to financially support it.