Again no one is being forced to play differently, many small guilds got to 100 without recruiting more people, and the renown gain and decay for them is unchanged from the old system to new. They just now have the option to get there faster, by recruiting more people to help them do so. If they prefer to stay small and do it as slow as the small guilds under the old system, then no one will force them to do otherwise.
These changes weren't about guild size, they were about the casuals and new players being excluded or kicked from guilds. I'm not sure why people are trying so hard to make an issue about size, unless they just like to complain about nothing, but it is incredibly silly to want a 6 man guild to be able to gain renown as fast as a 75 man guild. I don't see soloers asking to be able to complete raids on EE as easily as full 12 man groups do.....nor to get 6/12 people's pulls from each chest while they are soloing.