This is going to bite a bit, but the prospects are extraordinarily poor. Even for us, and we've been about for years and have a presence on Steam already.
Even now, I do contract work elsewhere to actually earn a living (and it earns me a far greater
living than games). I do my game coding agonisingly slowly when I'm not too knackered at night for maybe an hour a day. Obviously I'd rather be working full-time on games again but I've realised that this will be much easier when I'm completely out of debt, so to that end I intend to be debt-free in 3 years - including mortgage - which will give me a vast amount more license to do what the hell I want with my time.
As the first step towards starting any kind of business you must do some market research. This used to be extremely difficult but rejoice! It is now very easy. Take a look at SteamSpy
. Don't fool yourself into just looking at the top 10 lists and boggling at the incredible amounts of money. Instead look at the bottom 10. That's where you're likely to be. Indeed, look at the bottom 50% of revenues. And to be extra realistic, just focus on games released in, say, the last 3 months. Scrape all the data you can and draw conclusions as to your potential for success and the actual amount of money involved.
Regarding earnings-per-hour, game dev is generally extremely poor and tends to make below minimum wage (take a look here
for some thoughts on that). Just my literal 2p on the subject.