Larger homes: spread the investment
85% of wooden floors being sold are made of Oak. Oak will never go out of fashion, which means you don't have to worry it will not be for sale any more. Which brings us to the following: if you have a large home with many different rooms you could decide to spread the 'investment' over a period of time, doing one or two rooms at a time.
Most manufacturers will produce the same floor types for many years, so even if your total project takes more than one year your original selected floor type will still be around for you. And who says you should install the same wood floor everywhere? You could even decide to purchase a different one for the bedrooms - low traffic areas - than you have in your lounge - higher traffic area -, giving you even more options budget-wise.