I agree that there needs to be a back-alley stage but as for semi-modern street stage have you forgotten about the England stage!?
Well, that feels kinda like a ring, so I never really think about it being "On the street" like the street stages in 98 and XI... but yeah, guess it does count, lol.
Along with probably being able to at least fight in the Volcanic-looking Saiki stage, we actually have a very nice selection of stages already. Though I wonder now, if they'll make any certain stages have differnet forms as you fight? England and the Egyptian temple are the biggest changers ATM, so could they add more to already existing ones for console release? Imagine if China had day and dusk cycles added to the already-established night time?