Mmh for sake if argument, lets say that MM did not have any treasury (which by the way is not true, MM being one of the most profitable studio of sony WWS).
Lets say they started from scratch, they had to pay 50 devs on average for 7 years.
Employee cost based on glassdoor average in london would be 3,5k per month for that sort of job, 5k when including social charges roughly.
Thats 250K per months for all people adding to this exploitation charges of let's say 50K per month (location rent if they're not owning walls, food, furniture, power, etc....)
So we end with 300k/month, so roughly 3.6 millions per year, 25M for last 7 years. Remember these numbers are based on a VERY high average of everything. We're probably more around 20M total.
If that game is sold 60 bucks and sells 500k copies, studio will already be profitable by a margin.
I think it will sell more, and MM already generated big amount of cash for sony to support them before that. If mm was still independant they would break even very shortly after game lauches.
There is no way the game is a financial disappointment by just doing some unfair math toward MM.
Without even working there we can already know what will happen.