The issue with starter clubs and balls is that I don't want to switch back and forth between my normal club set and starter clubs. I have no doubt that I can switch to starter clubs and play a few weeks and get into a level where I can play around even par, there are a few tournaments that we do this in, but what is the reason for it. You will find the same people who win today will win with those clubs.
Does score to par really even matter? Play a course like St Andrews in real golf. The par is 72, on a still day with firm fairways the real par is probably closer to 66, turn up the wind and the rain and the real par is 78. It's all about the other players.
If WGT wants to make the game more difficult, make it so the clubs are not as foregiving and the putts don't drop as often. I consider myself (at least I was) a decent golfer with a handicap under 5. I can't hit a 300 yard drive into the fairway 95% of the time, I can't hit a 225 yard 3 iron into a green within 15 feet 90% of the time. My 8 foot putts go in about 45% of the time, not 90% of the time.
To fix the scoring average all those things are the only thing you can fine tune. Do that and listen to the bitching start. I dinged my drive and it only went 280 and didn't land in the center of the fairway. I dinged my approach shot and it is 15 feet away. I hit that putt perfect and it didn't go in. I hear that on a daily basis today.
I'd be happy to see WGT make the game more difficult in those ways, but until they do, you have to assume that par is about 8 under or more.