A year from now, I suspect you'll hear about as much "bitcoin" talk as you heard ".com" talk in 2001 The deafening silence a year after the "this time it's different!" bubble pops and all the paper millionaires are back driving cabs again (well, maybe driving Uber, that's the one part of this mania that really is different than the last one).
I think a lot about this. I have mined 2.8 ETH, and expect my hardware to last at least another 30 months. I'm also happy to hold onto the ETH for the next 12 years (selling it now would trigger short term capital gains).
So, is cryptocurrency going to be like the .coms where there was a bubble, and a crash, and now e-commerce is commonplace and amazon.com is eating the world? And if so, how do I diversify my cryptocurrency holdings so that in 12 years (the earliest that I can retire) I have a nice portfolio?
Also, I max out my 401k in equities, so this is all a fun side game really.
EDIT - In the worst case, I can always sell my ETH at a loss to offset other gains (or even $3K/year of ordinary income).