Okay then, let's call these "Guildwizards," thenQuote from Metaethics »A rose by any other name would smell as sweet. But a shoe called a "rose" still stinks.
Your proposal is interesting design space (it doesn't "stink"), but they're not guildmages. Should they replace them? That's a tough call; people expect guildmages because, in many sets, Guildmages were both fun and good. No guildmages in Ravnica is like no lords in a core set... possible, but disappointing.
Would you be against both cycles in the same set?
And yes, I am against having both, because while they approach it differently, they fill the same role.
I've never thought of the Guildmages as being a requirement for a Ravnica set anyway. They're neat, but so are charms and the new CCDD cycle, and charms haven't made a return.