I agree that, from a psychological point of view, this change is very hard to sell. As you correctly pointed out it looks like something is taken away. The outcry is even bigger as most traders here are trading with a rather small amount of capital.
Obviously, I would have prefered if there had been a discussion about this change beforehand. On the other hand, Darwinex is not a democracy but a business run by individuals who stand behind this company with their own net worth. I am sure they have discussed all effects of this change in length internally.
The amount of participation we have in many of the decisions is still exceptional and unusual for any company.
The main business model of Darwinex is not Darwinia but the allocation of investors' capital to talented traders. Investors decide where they put their money. The trader's capital usually doesn't play the biggest part in this decision process. So if a $100 account creates good scores and a solid looking track record you will be able to manage a serious amount of capital. So the "dream" is still possible.
Darwinia, however, is just a marketing tool to show the world that Darwinex as a company has trust in their scoring algorithms and will invest their own money into a couple of talented traders. For sure this monthly contest is not the most sophisticated way to invest but its simple enough for anyone to understand and everybody loves leaderboards
You can still be on top of the Darwinia leaderboard with a small account and get the resulting "publicity boost" for your Darwin. But now you won't get 300k no matter what but 30x your capital.
Personally, I just don't see why small accounts should be favoured over larger sized accounts. Currently its a freeroll for small account holders. This fact combined with purely automatic allocation decisions makes Darwina pretty vulnerable for exploits.
Now that time has passed and Darwinex matured. The next and bigger step would be to create a couple of Darwinex Funds that are acting like true smart investors with accessible track records open for everyone to see. This could be the proof that it is indeed possible to make money investing in Darwins. However, this is a lot harder to do. I would happily ditch Darwinia in exchange, though.
P.S.: this started as a personal response and ended as a general rant