I don't actually think we will tbh, unless something special came up. It'd be a huge gamble if you ask me, but I guess we have to trust Guardiola.
The arrival of Mahrez means Bernardo Silva can be pushed inside, which means we'd have at least six options for the three midfield positions:
Fernandinho
Gundogan
Delph
De Bruyne
David Silva
Bernardo Silva
It'd also mean potentially more game time for Foden, which would be a positive. Personally I'd like to see Stones given a chance as a pivot too, think he could excel in the role.
Yeah I think it's a bit of a risk hanging on another season but as you say, we have enough options that we might prefer to take that risk rather than get someone in for the sake of it. There'll probably be another two or three players we've never heard of who emerge over the next 12 months who would be a good fit so maybe we wait and spend big next year on that person.