It is impossible for you that is not the dev or an insider to know the life span of a coin no matter how long that you will take to make your research which makes it not a good option for one to invest on shitcoins but bitcoin.
This is why new investors should disregard anything about shitcoins
I don't like repeating myself because recently too much of shitcoins discussion which some people claim to know the best shitcoin to invest in when we know that it is very difficult to know the best shitcoins when there is no best and bitcoin is the best for everyone to invest in and reap from the fruit of his labour in future as long as he patiently build his bitcoin stash gradually every week or month with regular buying overtime.
I have carefully read through your opinion and that of the other three users, which I think you all have a point, but it seems to me that you aren't seeing the brighter side of their own explanation.
Firstly, you seem to be laying emphasis on shitcoins, while the other three users talked more about altcoin. But let me point out something very important here:
All shitcoins are altcoin, but all altcoins are not shitcoin.Some of us here, don't seem to understand the difference between shitcoins and altcoin, which has led us to categorizing both as same. Your statement emphasis on shitcoins, sounds as if you are categorizing them as altcoin, which I think it's not true. We have few altcoins, which I think are doing well, even without mentioning their names.
On the other hand, I consider those who buy shitcoins as gamblers and not investors. They usually purchase them at a very cheap amount, but in large quantity, hoping to make heavy profits from it in the future, but it turns out to be a failed project at the end of the day, leaving the gambler with dust.
Those altcoins that you think are good will not last in the market but bitcoin is here to stay.
And, I guess, the coin with the second largest market cap should have probably crashed a long time ago, isn't it?, Or is it not longer an altcoin?.
Why don't you check charts of some altcoins that experienced a dip along side Bitcoin sometime last here. They've also made some incredible price come back this year, even though we can't compare them to Bitcoin due to it's market cap and price different.
I personally don't encourage the buying of altcoin of any kind, due to their high level of centralization. Bitcoin is an ideal coin for any investor, but that doesn't mean that other coins should be ruled out from profitable assets.