How would you even "run the numbers"? How about try the idea and see if it works? All it would take is one hit game for devs to see the potential of web gaming

How would you even "run the numbers"? How about try the idea and see if it works? All it would take is one hit game for devs to see the potential of web gaming (and they already see it. Why do you think flash games were so popular?) If Fortnite could run in the browser it probably would have instantly become the biggest game in the world.