I disagree the Silver and Gold badges, even review badges are something to work towards.
Directly from the badge description page:
Gold Badges are rare. You’ll have to actively work toward these.
They’re something of an accomplishment!
Silver badges are awarded for longer term goals. Silver badges are
uncommon, but definitely attainable if you’re interested.
We should not be able to get any of the badges easily even the review badges. I think the thresholds should remain the same for all of the review queues.
If it takes years to get the badge, then all you are doing is spending time improving the community which is really the point. You shouldn't be reviewing just to get the badges.