This is what you are doing to bitcoin and pools. The goal of pools is not directly to "solve blocks", and saying that pool hoppers "help solve blocks" is a straw-man argument. A pool is there for bitcoin miners to pool their resources to reduce variability and get more regular payments. Miners do not pool mine to make more or less money, they pool mine to make the same expected amount, but not have to wait months for a payout. Having a bunch of opportunists jump on and saying we "help solve blocks" is merely a convenient and fallacious excuse for stealing the early shares in pool rounds that are compensated more because of the chance of a short round happening, in an otherwise fair payment system for full-time miners. You think your work should be paid more than everybody else's? You think everyone else's earnings should be decreased because the short rounds (that should compensate full-time miners for the long ones they suffer) are exploited? It is fair to hit the bandwidth of a dozen pools web pages every minute and open a bunch of TCP sockets, causing pool ops to need hardware upgrades and spend time with mitigation measures? You think pools want more variability - shorter short rounds and longer long rounds? That is an antisocial narcissistic notion.
Pool hoppers do decrease the earnings of everyone else in pools, and on bitcoin as a whole. Hoppers aren't adding more hashrate to bitcoin, they are just strategically moving around their share submissions to be compensated more for the same amount of work, more than others. This leaves less earnings for others on a pool, and less earnings for all bitcoin users. Legitimate pool miners have less time to submit shares in short rounds, and then they have to split those earnings with more people.
It is game on, pools that still prefer the proportional payment method should do whatever in their power makes their pool mining experience a positive one, including not having egocentrists degrade a fair rewards system and network stability.
If pools care so much about their miners, then why they don't implement a fair reward system like PPLNS or PPS ? PROP is not a fair system. If you submit shares late, you are being paid for them less than for shares submitted early (in terms of expected value), despite that you do the same amount of work - so how this is fair?
And hoppers degarding network stability or earnings of bitcoin as a whole? How? Even if someone cracked SH256 and was able to generate hashes with 100x speed than other it would not destabilize the system. Bitcoin doesn't care about the pools or hoppers. The only thing which matters is that a block should happen every 10 minutes. Who gets the block, doesn't really matter.