I think You're right But the way for There (HTML5 webgl) is a very long
I think the simplest solution is to make a player for the browser like Flash, unity Etc...
It will upgrade the system and many users will come.
And I would pay extra for this Extension. Even i even got the gold.
One of the problems on FPSC That I have not seen anyone talking about it is What to do in six months that I have a game that i have invested a lot of time on it??? I'm sure it will not sell, There are so many really good free games. With Exports to the browser you can put advertising on the site that shows the game. (And using FPSC becomes worth)
Without this FPSC becomes just for fun (It's not bad but it's not enough).