I have suggested eliminating decay entirely. How do you know Turbine is not open to that? I have been advocating for the removal or massive reduction of renown decay for many months. Up until very recently, I was pretty sure Turbine was not open to that. But now they are testing a system that is a massive reduction in renown decay. You don't know what Turbine is open to, and neither do I.
I have also proposed increasing the small guild bonus percentages, if needed, to keep small and tiny guilds viable and advancing.
The only other suggestion I can remember seeing for reducing the decay on small and tiny guilds was the one you made. But your suggestion involved going back to the old decay system and that I am not open to. The old decay system was just awful. I will not support any plan that can't be built upon the new decay system and forces us back to the old decay system. I am unwilling to undo all the good that has been done. I am perfectly willing to add to that good though.