further advantage of placing upward pressure on the price.
?? Why is this an advantage?
Sorry, that was a typo.
You are claiming that if your production costs just breaking even, you should just buy coins instead because it will place upward pressure on the price. If everyone did this, the network would cease to exist. Upward pressure isn't what we need, it's stability and security. One way to achieve this is with production cost parity. People shouldn't be making money for doing jack shit.
Where is the problem if lots of rigs cease their activity?
Maybe It could be a opportunity for people who are interested in Bitcoin, not in speculation.
The network will be stable, because it was stable in the early blocks.