Escaping middle management - MBA or small business

So, here's the deal.

I'm 31 years old, and currently in a role where I feel like I've fallen into middle management hell. I work as the Director of Mobile for a media company (build iphone, ipad, android, mobile web products). I'm sort of in a fast growing industry within a dying dinosaur.

Here's the problem: I feel like a terrible generalist. I'm not a developer. I don't have an MBA. I more of a product manager, and find myself writing requirements and arguing P&L's most of the day. I don't hate it, but I also don't feel that useful.

Looking to the future, I'm trying to find a way to use my background to:
(a) make considerably more money
(b) work for myself, or at least have a job situation where I have tons of flexibility to travel

The problem is, as a generalist, I feel like my ability to start small businesses is limited. I have some experience building ecommerce websites, affiliate marketing, etc, but haven't come up with any idea nearly good enough to replace my salary.

So I'm looking at 2 directions right now with the following problems:

1. Work for myself - but I am at a lack of ideas and skills - but this would be my dream
2. Keep climbing the corporate ladder and stay in the mobile industry. The good news is it is very quickly growing. However, without an MBA, I will struggle terribly. Also, as with any corporate gig, I feel that there will always be a ceiling on salary. The cost of an MBA will hurt (no company help at present), and it's not like I'd be going into investment banking or other high-return industries to offset that tuition.

Any suggestions? I'm feeling terribly distraught over my next move, as I feel this is a critical turning point in my life when I need to pick something and go with it.

This is my current thought right now.

My question is - would it be insane to try to do a new company + part time MBA + build a small business all at the same time?

I imagine my free time will be insanely limited for at least 3-4 years if I go that route. Honestly, I don't mind losing the free time, but I do worry that I wouldn't be able to dedicate enough time to a small biz.

For me, my heart is SCREAMING that I need to run my own small biz. I'm just struggling right now to come up with an idea good enough to replace salary right now.

Thanks Saville.

I am actually a fairly sharp guy, and have some skills that are very useful to making money ( web development, web marketing, etc ). So, it's very clear that the direction I need to head is down some kind of ecommerce / affiliate marketing / etc path.

I've since put together a list of 15 ideas, but none are really big enough to make enough money. Just not sure how long it's worth researching/not finding anything.

Yes, various web marketing skills, particularly search engine optimization, pay per click management, and some mobile consulting.

However, I really have desire to consult. It just means that you end up working for someone else. You just call them the customer instead of "boss". I realize that any business ultimately has to have a consumer, but I think there are better passive ways to go about it.