Lots of players go out on loan and return to make an impact at their clubs, or elsewhere... just from a quick look at England internationals, Frank Lampard, John Terry, David Beckham, Rio Ferdinand, Danny Murphy, Joe Hart, Harry Kane, Danny Rose, Kyle Walker, Ryan Bertrand, Jesse Lingard, Ross Barkley, Adam Lallana, Daniel Sturridge, Jermain Defoe... not to mention the likes of Christensen, Lukaku, Kevin de Bruyne, and I'm sure there are more.
Obviously this is not going to be the majority of them, as most are just loaned out because they're not good enough for the teams they currently play at.
This is not to say that loaning players out doesn't "work". The vast, vast majority of players that go through football academies turn out to be nothing as well, so you could say that "academies don't work" and scrap that as well?
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