Many people trade guild services with their kinmates and friends for items they can't access. Others roll up alt toons just for crafting. Guild recipes have no level limit, and for the most part no faction reputation gating access, so lowbie alts can still make all the guild recipes in most tiers. (Lothlorien guild recipes are the only faction rep gated guild recipes, although there are plenty of non-guild recipes in Mirkwood and higher areas that are rep gated.)
And watch out for all the Woodsmen and Explorers should they add the ability to join a second craft guild, unless they also add Prospecting, Forestry, and Farming guilds. Those professions only have one guild they can join anyway, and players in those professions might feel screwed over if you gave everyone else the ability to join two guilds.
So no, I wouldn't support this change.
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