Personally, I've never really understood the need to focus on one thing. My trick is to look into the future, pick a few possible outcomes. Work towards them and adapt along the way. I actually find that if I try too much to focus on one thing, I figure out how to exhaust myself with it.
With financial things I've always thought that spending isn't necessary. When I buy something, I always think: "Do I need this? Why am I buying this?". Sometimes it is enough that "I just feel like it now", most of the time "oh well, lets see if I still feel like it in a few weeks".
My ultimate goal is financial freedom - how I achieve that is up to me. In that regards, it gives me many different things to focus on.
So I say have your one large goal and focus your path to help you achieve it. That might mean many shorter, smaller goals will be reached along the way.