Sure, but don't forget most of them will only make those kinds of wages for maybe 10 years or less. So if they are being financially responsible they realize that it's not as much money as it looks, especially the ones on relatively modest (for the Prem) wages.
Much of it is pure speculation, agreed - but we KNOW their ambition. If they are truly committed to winning 'big' silverware it probably means rebuilding the entire team at least once, probably more.
If we look at Man City after they were bought by Shinawatra in 2008 (and subsequently the Abu Dhabi gang), they jettisoned existing players and immediately made some big buys - Robinho being the most famous - but many of those initial flashy singings were long gone and replaced by a new wave of flashy signings by the time they finally won a league title 4 years and 100 million+ GBP later....and then they went on to spend 10x that pursuing further league titles and a Champions League title that continues to elude them (snigger)
...and of course, Man City is a club that is, to give them their due, 'well-run' in the sense that their signings generally conform to a broader strategic vision, preferred tactical philosophy, and are employed by a manager who also fits in with those plans and philosophies (and indeed influences them). They tend not to make hasty, emotionally-driven decisions. Other rich clubs like Chelsea and PSG are much more short-termist, results-oriented, or run by people with more showmanship than football experience - a more risky approach that occasionally backfires spectacularly.