The only kind of owner that would significantly improve us is one who doesn't mind losing up to a billion or more pounds (plus have no problem paying for a new stadium) and now that the price of oil is bunk and Russia is in the toliet these people don't grow on trees. For every Man City owner there are ten to twenty nincompoops like the Venky's and Mike Ashley. American billionaires are no longer interested in the prem becasue they can buy an American pro sports team for less of an investment, which is pretty much a licence to print money not to mention of hundreds of millions of govt pork that cities hand to them. A much more likely situtation is that the "upgrade" that we'd get is a Randy Lerner type who comes in there, spends heavily for a season or 2, loses say a 100M or so, realizes that 100M in investments is in no way sufficient or enough to get a C-league spot and immediately closes down the shop. Then puts the side for sale, only to kind of take the side off the market after realizing that you could profit nicely not spending anything and finishing 16th every year.
Kenwright isn't great money wise but he does stay out of footie affairs and to my knowledge has never forced either Moyes or Martinez to sell a player they didn't want to. When bigger clubs come calling for our players we've held on to them while other somewhat richer sides (Spurs, Liverpool) couldn't hold onto theirs. We spent heavily last year and had on paper our deepest squad in years but flirted with relegation for a while and finished mid-table. So obviously some of the bills will have to paid this year. Not to mention that the manager came into this season with a few question marks and will have to prove himself again.