As with any business, if you wish to do well in life, do what you know best.
I'm fully with Jannie's last comments, this is totally how it is. I've been shooting full time for 15 years, mostly people and places up until about 4 years ago, now I shoot architecture. I still do people on the side of that, more creative work though and less of the **mundane. I think you have to go through the mundane to get to the creative to solidify your knowledge, but it takes a long time, and you need to be extremely good to do well, you need to be above the pack, my advice would be to check out your competition, if you're above them then go for it, if not stay in your day job, it's a tough job, and it is a job.. with great highs... and great lows. If you can handle that then delve in, but don't for a second think it's going to be an easy ride.
Yes, I threw it in for 5 months, didn't pick up the camera for that whole time, not even an inclination to. I still don't pick up the camera unless it has a $ assigned to it in one way or another, either in payment or an end result of portfolio quality. at the end of the day it is what I know really well and my uncle told me when i was in limbo.. "in life to do well you need to do well what you know well"
**mundane is being something you have done way too much. At the moment I'm doing the odd wedding, most would call weddings mundane, but I'm loving it as I get to shoot them how I want instead of how others want me to shoot. They're actually a creative outlet for me, and I don't do loads, thats not the aim for me, my aim is to do a few each summer, next summer I am nearly totally booked out every weekend, thats enough to create a name, then I'll be looking at ways to back them off and still make the same amount, and so this way they stay as that creative outlet & don't become mundane. They also keep my hand in with people skills, as being a photographer can be quite solo at times.
just my 2c