That won't decentralize the user base though - that would put more HP in the hands of the few that can afford to stack. Decentralization in my eyes would be everyone, even the ones selling. The stackers will build and separate themselves from those that have not anyway.
What people don't realise is that when we have a free market such as hive (or anywhere for that matter) those that have not will sell, and those that have will keep. It's the natural law of the world.
By doing this we'll just speed up the process.