There are currently 2400 tokens that are known and many unknown to anyone. By the end of the year 2020, at least 100-200 new tokens will be created. Every day in the world there are 5 new airdrops. I think it is not realistic to calculate. But I'm pretty sure new tokens are being created more than they are being deleted.
But we have to buy only good market capitalization coins. Don't invest money in shit coins.
But we are sure that the top crypto would still be part of those who would survive for me it is already clear unless there would be a huge issue that would totally destroy them.
There are already so many shitcoins and there are more to come and we could expect that some crypto who have value today could become worthless tomorrow.