There are many top players who don't seem to lack motivation despite being paid hundreds of thousands of pounds per week. If we have overweight players in the team then that's their individual responsibility.
And you seem to be advocating a return to a system where everyone has to fight to keep a roof over their heads and make ends meet, just so that the motivation for hard work and graft is stronger. That would be a regressive move, and would undermine all the advancements in labour rights over the last 2 centuries.