"Now I just need to sustain this rate of burn after having picked the low hanging fruit. With most of the cards being one time only, do you think that your rate of burn can be sustained with credit card sign ups in 2012?"

That's the question, isn't it? A few years from now will be looking back nostagically, "Remember the early 2010's when we could get seemingly endless mileage bonuses from credit card companies with very little effort, and take trips all over the world? Those were the days..."

Or will competition keep the excitement going, with new products and bonuses coming up regularly?