My own thoughts on this, albeit without the statistics to back up my opinion, is that although there are many players who will play repeated rounds, does it necessarily mean individual game time is increased?
Other than in US and British Open qualifying, I don't bother with repeated attempts on unlimited play run of the mill tournaments. Does that mean I play less WGT as a result? Well level 102 would suggest the answer is no.
When I am not playing an unlimited tournament, I am playing something else. I am sure that must be the case for many other players. So this weekend I will be playing ready goes and alts instead of a few practice rounds, leading to playing the tournament itself. My game time will be pretty much the same.
I much prefer the pressure of a single play in a meaningful tournament than the "Oops, ah well never mind, hit restart" in an unlimited.