As someone who runs a music label, ans has been doing this since 1999, it's not worth it to invest heavily into music. The people that make money in the industry, aren't the people that play the instruments. It's a long gone dream of just making music that has turned into payola, social media corruption, fake audiences, and negative things like drug abuse, lip syncing, fraud, suicide and ghost writers. Don't wish it…
Are session musicians still a thing? I would guess that the way music is recorded and produced now, session musicians are much less in demand, but I really don't know. Just seems that the ability to sit down and sight read a part and play it perfectly through in one or two takes is not really needed anymore, when songs are pieced together almost note by note in a computer/DAW. "Before Pro Tools, there were pros"
The problem is that you need superstar skills to pass the threshold of actually getting those gigs - you have to show up and just be able to nail things on the first take, and even improvise your part if asked.
If you aren't fussy about sound quality, then it's not really important how the part is played, but that's also why music has such a crisis as an economic activity; sequenced and prerecorded substitutes for live performance aren't timbrally the same, but they let you communicate all the structural information of the music. In a sense, it's like we replaced listening with reading, and that's a problem when so much of music is relatively similar.