The number of years of the tour means nothing. It's about the venue size and ticket price.

I feel like it could, but the ticket prices will make it harder, and i dont see Katy doing more than 150 dates. I (with no receipts to back me up) feel like she doesnt really like touring that much

No. Isn't she charging the same with less dates. I think she needs more dates to cross it.

She might, her tour is doing amazingly.