I think you're wrong. No way is Guardiola going to bring in 8 or 9 first team players in one summer. It would actually make his job harder if he brought in almost an entire new first team squad in 3 months. Not only would those 8 or 9 have to bed in and get used to the club, used to Manchester, used to the Premier League, but he'd also be alienating pretty much the whole first team squad that was here before. He'd essentially be saying they weren't good enough.
I actually disagree with Ric, I don't think the funds will be a problem. With the huge CL money we got from this year, the huge PL money we're getting next year, we'll have one of, if not the biggest transfer budget in the world this summer. I don' think there is a single player Pep will ask for and be told by the board "we can't afford them."
Yaya is almost certainly going, I can't see Fernando playing at all under Pep, and I don't think Delph is quite of the required standard to play CM in a Guardiola team. He tends to like to swamp his squad with midfielders, so I'd be very surprised if he buys less then 2 CM this summer. My guess is he might try to get 3.
DeMichelis is leaving, so we need at least one new centre half. Navas doesn't strike me as a Guardiola player, so I'd assume we'll definitely be buying a new right winger. So there's 4 or 5 signings that are needed before we've even started.
I don't think any of our current full backs will still be there when Guardiola leaves in 3 years time. They will gradually replaced. But it's foolish to think he's going to buy 4 new ones this summer.
I definitely expect Clichy and Sagna to stay. I'm not sure about Kolarov and Zabba, but I would probably expect them both to leave. We have players who could play there in a Guardiola system though. Delph could probably be nurtured in to a left wing back in a Pep team. Perhaps Fernandinho too on the right.
We've got too much work to do elsewhere in the team to be worrying too much about our second choice full backs. 2 new ones this summer, maybe, 4 new ones? No chance.