It is never late to invest in cryptocurrencies despite industry volatility. It is important not to put all your eggs in one crypto basket and as part of a diversified portfolio of different assets, digital currencies can be a viable part of a financial strategy.
I think altcoins can last for the next 5 years or so only if there's an active dev working on it and if that altcoin has a good project not only in the present but also has a good projection as time goes by.
There are a lot of upcoming big and good projects in terms of ICO's. One of them is Βitozz, it is one of the new cryptocurrency exchanges that provide traders a new level of trading experience. You may want to check the links below.
I don't think it's the end of crypto. If you haven't sell your holdings, you don't loose your investments. Just hold whatever you have and over the time definitely you will see some definitive profits, given your portfolio is diverse.
One of the more interesting experience in trading is that we as traders sometimes trade poorly, miss opportunities, and lose money and then will proceed to do exactly the same things the next day and the next week. I invested in bitcoin last year 2017 and missed its peak because I was still holding it. However, it didn't stopped me from investing and holding coins as I already made profit out of it.