My opinion , Crypto coin market should clear those untrusted coin which is scam or those is unable to move on.
we need something to clear those coin. Am i right..
Actually this cleaning up is followed on the CMC that is coin market cap website. If you observe then there are few days which are allowed for each coin to get listed on the CMC. If they found that the altcoin is not receiving any kind of volume, the market is dead or the volume itself is dead then CMC will take strict action and will remove them immediately from the panel. So they are already following the cleaning up procedure these days.
I have seen CMC removing more than 100 coins in single day. I think last month only when CMC reached 1600 count of coins then they removed almost 100 of them as they were scams, dead coins. Now the count is back to 1600 which tells us that so many coins are coming every other day.
I have also seen exchanges delisting dead coins, but we can tell, they would never get to the end of it, because of the free market and the decentralized nature of coins and their deployment. Moreover, since money can be made through these coins/tokens, trust people to keep coming up with more, notwithstanding they're worth nothing!