Once more, and then I'll just have to accept that having a vested interest means you lot will never get it.
The 21 million units that are labelled Bitcoin are just an abstraction, the Bitcoin system is actually comprised of 2.1 quadrillion subunits, which can be inflated to infinity. Now you all cry that making a currency more divisible isn't the same as inflating the supply, but the comparison is being made to long established currencies which are well defined in the market. Of course the sleight of hand here is to fix the supply of the highest denomination unit to 21 million, thus ensuring that those holding whole Bitcoins will get relatively richer and richer as more and more Bitcoin subunits are required to buy a single Bitcoin.
And why 21 million Bitcoins, why not just 1? With infinite divisibility why do you need more than 1? Or perhaps that would make it a little too easy for people to see that in a system where one tiny part of the whole and the whole can perform the same function , and that whole can be broken up to infinity, that the claims of supply constraint are meaningless.
I think you are misunderstanding inflation.
Thought experiment, imagine every dollar bill in existence magically had an extra 0 printed on them (lets suppose there are no fractions of dollars for simplicities sake). Every 1 dollar bill becomes a 10 dollar bill, every 10 dollar bill would become a 100 dollar bill etc. What would happen? As soon as everyone has figured this out, the only thing that would happen is that everyone ads a 0 on all their price tags as well, so that a good that previously cost 3 dollars would now cost 30 dollars. You could argue that the dollar supply, in terms of the "base unit", increased tenfold, but this wouldn't matter as everones wealth in dollars did as well.
This is the kind of "inflation" of base units bitcoins may experience. It is irrellevant. Inflation doesn't have bad consequences of itself. It is bad because it usually comes with a redistributive effect of wealth. If newly created money is spent into the economy from a fixed point, those who get it early benefit at the expense of those that get it late. As long as new money is distributed based on what you already own, the only effect will be new prices in terms of what you seem to call the "base unit".