Happy new year.
In terms of the other questions, the network will balance the amount required to store and also what it pays out for farming. There is no built in inflation/deflation etc.
In terms of others creating tokens, they will have a similar impact on safecoin as alt tokens on bitcoin, I presume. In terms of safecoin, I do not see that make a difference as safecoin is a utility token really that has value from "scarcity" (as some talk of now, although I think that's a red herring) and more importantly (IMO) "utility", i.e. backed by a "useful thing" with a "useful purpose" (maintain the worlds data).
In the broader terms of trading, I hold no opinion whatsoever, sorry, but I am too involved in the creation to worry about the costs attributed by all of us to this value proposition. I feel that it is very likely a step in the more honest direction of currency, like many projects. I suspect MaidSafe is very different from many though as many of our staff now do not have or have never had any crypto currency wallets. Our focus as a project is not currency, although that makes up a vital part of the overall proposition. We do not try and measure or guess that measurement, but spend time ensuring the value is delivered.
In saying that we obviously believe this is a compelling proposition and will have significant value to everyone.
Personally I like the idea of early adopters benefiting, but am more driven by the notion that as many people as possible benefit, not from trading, but from "use". There is a lot more to say on this, but the drive for us is "Privacy Security and Freedom" for all the worlds people, cash, profits etc. are part of it, but for it to be the most fair it needs to be value from use IMHO.
So early adopters "use" is not to be underestimated, but I think it's good to see that as a step on the journey.