I agree on the network trust value, but I would disagree on the mining costs.

The cost of mining has a direct impact on LIQUIDITY.

And I mean by liquidity:

The degree of an asset's ability to be converted to cash or to make transactions at its fair market price

With a low liquidity, a currency loses value as it becomes more and more difficult to make transactions.

What made bitcoin rise is its liquidity, and especially on some markets at the begining (silkroad...).

Hence, it you want bitcoin to rise, you must facilitate transactions. Especially if you aim mass adoption (ie. e-commerce at Amazon scale)