1) bitcoin CAN be created in unlimited amounts, in the form of alternate crypto currencies, because the alternates serve the exact (if not better) functions/purposes that bitcoin does. Sure there won't be more than 21 million "bitcoins" in the universe, but there can (and will if bitcoin is mass adopted) be infinite amounts of cryptos just like bitcoin. It is only a matter of time. In this sense, bitcoin is no different from tulip bulbs, granite rocks, etc.
Any clone is a clone and no longer bitcoin, thus the number of bitcoin is limited. There might be other successfull cryptos. Bitcoin is different from tulpis in that tulpis have a possible unlimited supply as well as a limited lifetime. I dont even understand the comparison other than that you are trying to hint at the first known instance of a price crash.
2) gold cannot be re created. There is only a set amount of gold in the universe (unless you create it at the atomic level which will cost much more than the gold created).
Gold can be created, it fact there are facilities that actually do that right now. Also if we assume an infinity universe (not a loopback infinity one, but proper endless as natural numbers) there is an infinity supply of gold, the question is only how expensive it is to get. Wasnt there is planet which is just a big diamond? Maybe our universe is not infinity but for our small minds it might just as well be. Bitcoin is very different as the hard coded rules dictate that there will be 20999999.9769 BTC unless there is a fork, which will result in an alt coin unless the majority of bitcoin users decide to follow the fork.
3) in this sense, bitcoin ultimately is not inflation free and is not unlimited. People will start to adopt bitcoin, and ultimately crypto currencies in general. New and better crypto currencies will inevitably develop and hence inflation happens in due time. And price starts to free fall.
In this sense, you confuse cryptocurrencies as a whole with bitcoin, a very specific cryptocurrencies with very specific rules.
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I could tomorow create a new "coin" with same functions/protocols as bitcoin.
No you cant. Bitcoin is more than just the code you would copy. Your copycoin would never reach the adoption rate of bitcoin, thats what makes 1 bitcoin so expensive and all those other "new" and "better" coins so worthless. I can spend bitcoin in so many ways, but your copycoin? Nope, not accepted here.