That graph is only for 2019 right ? We all knew that 2019 was not a good time to trade altcoins especially in q1 and q2 but there is still hope for q3 and q4 for the accumulation zone which in my opinion already began. You will be surprised to see what 2020 and 2021 will bring for good altcoins and I'm taking only for a few of them.
If you hold bags of dead coins better dump them before they go to 0 as most of them took 90% from initial investors and they don't plan to ever come back to that price. Just have a look on ROI on every major altcoin and you will see that almost none of them return something to the investors since the last bull run. Furthermore they won't even think to exit scam as they already did long time ago ( check masternodes per example and you will see what I'm talking about ). Another problem will be the fact that people will keep buying dead altcoins, keeping them alive in some way when they should get abolish from the markets.
It doesn't really matter. Altcoins didn't really exists as a thing back then. While I still believe CMC chart is very vague, misleading and pretty unaccurate (because it shows an actual lower % of BTC domination than it really is because of reasons explained above in another post I made) it's still pretty telling:
https://coinmarketcap.com/charts/#dominance-percentageAltcoins ere a fad, a come and go thing. I give it another go, another chance to dump your coins during the next Bitcoin craze to $100k. That will be when the tide finally shifts and even the dumbest guy in town already knows altcoins are scams to get more BTC from the unexperienced.
Unless an altcoin comes up with groundbreaking stuff at the fundamental levels, we are going back to 95% BTC dominance (real, not CMC levels) easily. By CMC levels, I think we can hit 75 to 80% during the next 5 years.