Large Format is so much fun, and so different! Its completely different to small formats, so its not about supplanting them. Its an addition, a new skill and medium. Apart from cruising the large format forum (another site), the best article I've read for newbies is this;
Originally Posted by Edman22
I ended up buying the same Camera brand new from Badget Graphic, a wonderful shop in the US with a new Rodenstock 240mm lens and a second hand Super Angulon F8 (also based on recommendation from Kenny). These are cheap, plentiful, small and wonderful. The Tackihara folded up is smaller and lighter than my D50 DSLR (the smallest and light DSLR).
You can buy second hand for a field camera, but unless you buy something really heavy and solid, they can sag/flex over a few decades, and the Tak is cheap new anyways. So why not support a company with your Wallet? The whole setup will cost lest than an L-series lens.
Film is cheap, as you use bugger all.