It is not easy to detect those who are here for the short term, someone might seem to be a long term holder but due to rewards being linear one could accumulate 100k HP and power it all down the same as it was 1k HP.

Selling pressure is not a problem imho, it is rather the fact that the main incentive (resource credits) is not yet scarce enough due to the current abundance of bandwidth we have.

That will change though as the network grows and dapps onboard more users.