What I would like is for LEGO to come down in price on the secondary market. There are a lot of things that are vastly overpriced. As a collector, I am only interested in obtaining LEGO. Since I am not an investor, someone who plans to resell their LEGO in the future, I would not be bothered by the bursting of the bubble. It would likely help me to get more LEGO. I think that, while investing is bringing in business to LEGO, it is making it more difficult for the average collector to obtain LEGO.
I'd agree with the above posters who would like things to even out. I think that this would bring down some of the outrageous prices while still allowing serious investors to profit, and keeping the secondary market for pieces viable.