Rewards, plural, yet you announce only one and give no clue to how many more will be in the future or when.
So you're getting something you weren't getting before, but your dissatisfied you aren't getting more.
But anything else, and the 4-men requirement for starting a guild should be lifted and offline invites made possible (to invite alts). So people without a guild aren't placed at any gametechnical disadvantage, but have a convenient option to start their own 1-man guild if they want.
That would defeat the purpose of guild bonuses. They're trying to encourage people to group up with other players, not just form (1-person) guilds for sake of forming (1-person) guilds.