$20 in how many years do you think? No doubt, Polygon is a solid blockchain and has the potential to really do well in long term. In my opinion, 20$ may not be achievable in 5 years taking into account the current conditions of the cryptocurrency space. Well, nothing is impossible, I'm bullish on Polygon (MATIC) for a long term.
Maybe by the time Bitcoin hit 1 million dollars 
and that is said to happen by 2030 so we need to wait for 8 years before we saw matic hovering around that price level. I think matic isn't that solid enough because there are some issues that this coin had experienced and maybe that was the reason why its value hardly moves but let's see if there's something that matic devs can do about it.If they still want their coin to succeed then they will try their best to improve the coin so that it will run well since there were so many people who expects a lot from this coin as it is known to be an alternative to ETH. If not then BSC/BNB can take the lead and maybe followed by SOL.