The position I'm considering is in a decent sized datacenter.  The money is pretty good for the location, and the location is pretty much where I want to be (just one county away).  I'm just not sure that it would present a sufficient challenge to keep me interested and afford me the opportunity to maintain and improve my skills.

Many people are happy being drones, doing the same thing day after day without change.  Dear old dad worked the Post Office for 35 years.  I could never do that.  I like network and systems because there's always something to upgrade, as everything is new every couple of years, and I enjoy making sure that the routers and switches do their jobs, keeping the servers up and running, ensuring that everything is backed up, and that the software stays patched and is kept up to date.  Once or twice a year, a massive project comes up as either the swtiches, routers, servers, or softwares come to the end of life and have to be replaced, upgraded, or moved around.

In the bitcoin mine, you're talking about a raspberry pi, a custom rom of linux that someone else has provided for you.  As new ASICs come in, they get installed.  As old ASICs die, they get replaced.  As we run out of room, slow ASICs get replaced by new ASICs.  The network seems like it would be pretty flat.  With thousands of machines all doing the same thing, there's very little need to do much more than plug them in and provide them with an address.  It just sounds so tedious.