"Those companies are getting into content because they have no choice."That's precisely my point. In an oligopolistic market, when the oligopolists (the entertainment congloms) overplay their hand, new entrants emerge to compete with them. Sometimes by choice, and sometimes by necessity. In this case, what's happening is what you're describing: distributors are getting priced out of carrying the product they distribute; ergo, they will need to create their own product. This is what I mean by saying that the entertainment companies will "kill themselves" if they keep squeezing distributors for much longer. They don't have viable distribution pipelines to compete with these distributors, and their ignorance of that fact will be their downfall.
In the long run, it's much easier and less expensive to create a great show (or album, or film) than it is to build, grow, and maintain a great digital distribution company. The distributors will have an easier time getting into the original content business than the content companies will have getting into distribution. Time and economics are on the distributors' side in this battle.
"Think about it, if traditional label struggles with people no longer buying full albums, how is a subscription label going to survive on $10/month?"
A traditional label's economics depend on getting consumers to buy albums in excess of $10 a pop, or tracks at $1 a pop, because the label bears so many costs in producing and marketing its music. It spends a fortune on advertising, promotions, executive salaries, and so forth, and it passes all of those costs on to the consumer in the form of CD prices that are astronomically higher than the raw price of the discs themselves. Present-day a la carte music pricing is still, by and large, reflective of the marketing and overhead costs of these labels.
If you take the costs of running a traditional label out of the equation, and build a label from the ground up -- entirely digitally -- you can avoid a lot of the costs that traditional labels continue to bear. For instance: if a company like Spotify or Pandora were it to court its own artists, it would not need to spend a fortune on marketing and advertising. It could rely on the mechanics of collaborative filtering, organic search, and word of mouth to get its artists discovered by users. As for the $10/month pricing, that would depend on generating enough new artists at scale, so that users felt satisfied by the overall selection on the subscription service.