If you have a sufficiently big playoff system, there will always be chances to qualify for playoffs and then win it all. For example, two groups of 10, where the first 3 get qualified for playoffs, 4-5 or 4-7 play in a mini-playoff to qualify for playoffs.Is it though? Without the threat of relegation, or consequences for playing badly, there are going to be so many dead rubber games where it literally doesn't matter if either team playing wins loses or draws - glorified exhibition games for the excitement of no one.
Competition without competition is pointless and f*cking boring.
It works very well in American sports, clubs try hard even when they are hopeless. And you can always add incentives.
Finally, many clubs do not play for anything in England anyway. You have 1-2 clubs fighting for titles, another 3-4 for UCL (no one in England cares about EL), and 3-4 to not get relegated. The remaining, are just there.
Check the current table. City is already champions, United is already in UCL. 3-7 (maybe 8 if you count Everton) are in play for UCL. 15-18 are fighting to not get relegated. So only 9 or so clubs are fighting for something. But I guess we'll still check the next games despite that in almost all of them, at least one of the teams is fighting for nothing.