So am I and no, it is not economically viable. If Bitcoin was to completely replace fiat somehow one day and we discard all possible transitory effects as well as Bitcoin's current shortcomings (like transaction costs, confirmation times, etc) as inconsequential, the current level of economic cooperation and development mediated by fiat won't be sustainable, end of story. In effect, that would mean that the world economies would collapse in no time, and given that there are over 7B people now living, the things will quickly develop according to the Mad Max scenario, if not worse than that. Let's assume that the use of Bitcoin is forced upon humans by an almighty entity (or aliens) and there is no way back to fiat money. Just in case, you can substitute any other hard asset for Bitcoin in this hypothetical environment. It will still end in a disaster.
While many countries have reserves in another currency, countries are predominantly using different fiat currencies in international commerce. How is economic cooperation and development mediated by fiat? Economic cooperation and development can be mediated by any currency, or currencies, as it is now. Cooperation and development occurs through trade negotiations, international law, governmental and non-governmental organizations, etc. I'm not talking about anyone forcing the use of bitcoin, eg I mentioned above the possible combination of cryptocurrency and gold. Eg, governments may be using a decentralized cryptocurrency, but gold might still be used by individuals, and in some retail transactions.
To use deflation to mean anything else is just wrong. You say "deflationary in a broader sense of not being able or sufficient to satisfy the needs of a growing economy". That is a very common misconception in economics. "That there should be enough monetary supply to support such growth at all times" is flat out wrong. Economic growth is based on productivity and is not held back by monetary supply. This specific argument you make was analyzed in great detail and refuted in Rothbard's book The Mystery of Banking. I'm sure you will find the refutation in many other books/places as well.
Producers profits are not dependent on inflation rates. I'd like to know what your source on that is. And any references on this forum I'd be happy to look at. Inflation/deflation are monetary phenomenon. Have you studied Nobel Prize winner Milton Friedman's books/discussions on monetary policy and inflation?
The fact that you need sources and cling to sources yourself says pretty much all. You are on your own here (and there).
The references were for your benefit. I am extensively read in economics and I studied it in school. I chose those 3 references to address the 3 specific points that you made. What is the source of your knowledge, your own mind? If you have references for any of those points (or even discussions on this forum which you mentioned in passing), I would take a look at them.