Yes it is. Bitcoin is by far the most successful cryptocurrency project, the success of which has not yet been repeated by anyone. I think that after halving it will become even more valuable and expensive.
Of course, there are other quite successful crypto projects, but still they are far from bitcoin. Probably the success of BTC in 2017 will not be surpassed anymore. but bitcoin will remain the dominant cryptocurrency.
I'm not sure that we will see a price of 20k for 1 Bitcoin again, but the hope inside me still lives and something tells me that this is quite possible. Not so long ago, the price of 1k dollars was fantastic, and today we are more than 8k. Or maybe it's just a fantasy warmed up by a Bitcoin guru and various yellow media.
After the implementation of halving protocol, bitcoin should become more valuable to society and especially to mining. This can trigger growth to the first resistance