When
BTC Bitcoin pumps in 2020 after halving, what effect will it have alt coins?

It is difficult to know, it seems many believe that if the price of bitcoin goes up alts will follow but the recent growth of bitcoin and the lack of performance by altcoins challenges that theory, it seems many people, myself included, are tired of altcoins an their empty promises, if they want to convince investors to invest in them large quantities of money as it happened in 2017 then they need to begin to show results and for what I can see this is not close to happen so the skepticism towards altcoins will continue for a long time.
Hmm, that is a word that should ring bells in the ears of those projects the lack of performance challenges the theory, which I could also called self-made believe theory. The altcoin industry will not grow until we stop lying to our self and then tell the truth to those project developer who are the ones destroying the ICO industry with their lack of performance.
People take altcoin season as though it is a spirit that has been promised to be released at a particular time, or one that follows a particular trend, but even if altcoin season is a sprit, such sprit will not be released until the ICO projects starts performing to optimum capacity as they promised in their whitepaper, and they need to go back to their road map and the work according to what they have promised there.