There's some good points there, but to be able to come to conclusion, I also think an argument needs to also have some numbers to back it up. Sure, physical copies are cheaper to make (at least I would assume - of course Blu-ray discs might be more expensive than CDs). On the other hand, all those new revenue streams might not be enough to cover the losses elsewhere. Or they might be, but we can't know for sure without knowing how much money is spent on creating and marketing new games and how much money is being made from new channels such as season passes and microtransactions. I would assume it all also depends on the game, since some games have no microtransactions whereas some are free and rely completely on them.
That said, I'm quite skeptical about recent talks about increasing the prices because of development costs. I expect new revenue channels to have fixed the situation, and I doubt the new generation is enough to really change that enough to really justify increasing game prices. I think it's possible that game prices are being increased because a new generation is seen as a chance to try to do so - and also because it's probably getting harder to come up with new revenue streams that don't anger the consumers.