~snip~
With the approaching news of bull run and present the value of altcoins,
Approaching news? There is no bull run news, those are merely opinions from some of these so called experts. Some say 2019 will remain bearish.
1. can the altcoins ever hit the ATH price even at $20000 bitcoin?
There is always that possibility since you never mentioned any time table. Everything depends on which altcoin.