Bad slipping is usually the end of the road, yeah. If the car were very clean, it would be worth fixing but if it has its share of dings and scrapes and interior wear, then it's marginal. Deciding to fix it or not rather depends on what else is wrong with it. Let's say it's worth $3500---well what can you buy for $3500 in your next of the woods--anything comparable to your CR-V with a rebuilt transmission?
You're certainly welcome to try a fluid change and filter, but I wouldn't get my hopes up.