Big markecap altcoins are somewhat called good altcoins, but still that depends on how every will see a certain coin.
If we are talking about altcoins that won't or avoid to invest, I think there's thousands of then, or maybe 10 thousands or more.
The fact that majority of the altcoins are scams, I believe 90% of the altcoins are not worth to invest in.
Altcoins are a very risky investment in this market because these are very easy to collapse coins and can be easily manipulated if whales hold large numbers. I think now is the time when a lot of people will tend to sell more because everyone's psychology is currently very bad and they don't have much confidence in investing. If this does not improve soon, only good coins will exist in this market.
I'm not a prediction expert but 95% of altcoins will be wiped out of this market as most altcoins do not bring any profit to investors this year.