Miners have sunk costs.  They are invested and can't simply pull out their $3000, $6000 or $6000000 invested into sunk costs.  Mining is what makes BTC different than past efforts like PayPal and RipplePay.  I think it's very smart because those who have the most invested - and at stake - are those who guide the long-term solutions. 

If you hold $3000 in BTC, it'd be fairly easy to dump at $2200 and get some money back.  Mining operations would simply either turn off their miners if the price gets too low, which would reduce security, or start mining another SHA256 coin with lower difficulty and greater returns.  Mining is how you vote.

I am mining BU because the slow transaction times and high fees are reducing the quantity demanded, which keeps price down.  Bitcoin Unlimited is the *only* choice for that.  SegWit is to stop double spends and fix hash issues.  They've since said it can be 1.2MB, 2MB, 3MB ... 4MB.

At some point we will get to layer two, but we need to get layer one right and it's going to take time.  That's okay.