We will see the "big bitcoin fall" very soon.
You are making a few assumptions that don't take into account:
1) Block size changing (amount of transactions per block increasing)
2) Asics being used for heating thus 99.9% of energy being converting into needed product and mining for BTC merely being a product that subsidizes the energy bill
You do understand that ASIC's are very cheap to manufacture once designed and tested and that we are just going through a transitional period
where the 10+ ASIC fabs are recouping initial capital investment costs right?
But at some point, the inflow of capital will be unable to keep up, and we will see the depreciation, we are possibly seeing it right now.
Potentially, but as outlined by Vitalik Buterin:
https://blog.ethereum.org/2014/06/19/mining/There are many solutions to your proposed dilemma that can be adopted in the future. The right course of action may be doing nothing as
the laws of thermodynamics and economics will converge to automatically solve the cost issue, centralization dilemma, and environmental concerns.
This is not to say that we shouldn't be vigilant and try and promote a quicker adoption into ASIC decentralization...yes, by all means, join us and
help decentralize ASIC's.