Yeah it is true what you say is a very good method to do. But I think now is still not the methods available, because I see all of the platform was thinking about how best to make everyone use the bitcoin and after the plan has been reached it is then they think about seeing active users using bitcoin

You got it and  im thinking the  same way too, its  impossible  for us to track how many  people are engage into bitcoin since btc itself is anonymous and  we  wont have any idea to track people  who uses it but  one things for sure, people  who are buying ,using ,trading bitcoin is  increasing  because  we cant really stop its adoption.

They are not countless technically, though a lot, but just because we have no sources to find the exact number of users so it is not possible to be done.
If a team makes an effort to visit all the world, every city and every corner of it to find if who is using bitcoin then maybe it will be done, otherwise no software or any other method can count them simply.

It's no use if you will know the exact amount of people who uses bitcoin in the whole world likes like wasting our time to count who uses bitcoin and who the most country uses bitcoin simple visit blockchain and see how many transaction are being made per hour per minutes and per seconds and you can see thats lots of pople are using bitcoins lol

I think there is no point in knowing what number of users are using bitcoin as it will never show us the exact number and it will surely waste our time, so I think we should avoid it and continue our  journey with bitcoins.

The truth really is we don't know and can't predict on how many of us using the bitcoin and this furom is cannot be our only basis since there are some users are doesnt know about bitcointalk and mostly of them are on standby in some social media sites, so for that totally numbers are unknown and cannot be counted by any machinery existing today, and as i've see i saw numerous new people are trying to use bitcoins and that could be good since it can raise the bitcoin market.

I think to determine the actual number of people using bitcoin is can be found in the exchange platform, or in the blockchain. But not precise count I think.

Having the upper limit of the possible Bitcoin users wouldn't help at all since it would be really really far from the actual number of people using Bitcoins. The upper limit becomes irrelevant. It's just like when we say that we the lower limit is 0 and the actual number is in trillions.

Not only that people are using multiple addresses but also there are websites like gambling sites, exchange sites, and other bitcoin wallet sites that has thousands of addresses for their current and future users.

Not everyone trade bitcoins with other currencies also not everyone use blockchain.info
So predicting the numbers of users on these things is useless.
If I am not wrong then many Darknet websites uses Bitcoin and counting the users who use bitcoins there is nearly impossible.
So I think it's impossible to find the number of users using bitcoin , It's like counting the starts.

It's totally impossible to count the total user of bitcoin.
In one way bitcoin is anonymous and in another way in bitcoin world hardly few user usages real info for creating bitcoin wallet. And 1 user usage 1 to 2 or more wallet so it's quite unpredictable to figure out the exact number of bitcoin user. If one want to know then he might have to conduct world wide census.