Well, I didn't mind the Big Four back in the day - Royal Rumble, Wrestlemania, Summerslam, Survivor Series (and King Of The Ring when it came in later, though by that time, it would only be two more years before they took the monthly PPV route with the In Your House PPVs) - but nowadays, I'd say anywhere from 6 to 8 PPVs would be my ideal number of shows in a perfect world.
Royal Rumble would be at the middle or end of January. Putting it in the middle gives them more time to build towards Wrestlemania, especially since I'd skip Elimination Chamber in February. If the Rumble is the "Road To Wrestlemania" like it's promoted as, then why not immediately start building from one event straight into the next? They can easily configure some other method of qualifying for a title shot against whatever world champion doesn't have an opponent (or just unify the belts, solves the problem of that right there.) Then maybe Backlash at the first/middle of May in order to get a post-Wrestlemania PPV right off the bat. And I do mean just plain old Backlash, not anything like Extreme Rules where every match has a stipulation to it. Then Money In The Bank around the end of June or the first of July to start the summer off strong. Then Summerslam at the end of August, which gives them a nice two months of build. Then a PPV in between Summerslam and Survivor Series sometime around the first of October. Unforgiven? Judgment Day? No Mercy? Battleground? Just pick a good PPV name from the past. I might be against TLC or Hell In A Cell since I don't want another gimmick PPV right before Survivor Series, but I'm not 100% certain on that yet. Then Survivor Series at the end of November or first of December.
The only thing I'm really unsure is whether to also put one in between Survivor Series and the Royal Rumble. You could argue that not slapping one in the middle of those two gives them more time to build to the Rumble, but the Rumble doesn't exactly need more than the usual build anyway. The card is always shortened because of the length of the Rumble match, and the Rumble match, which is the main attraction of the show, is easy to build towards. Just announce it and have everyone talk about how much they want to win it and that's it. For now though, I'll just keep it to 7.
So...
Royal Rumble (middle or end of January)
Wrestlemania (first ten days of April somewhere)
Backlash (first or middle of May)
Money In The Bank (early July)
Summerslam (end of August)
TLC/Hell In A Cell/Unforgiven/Judgment Day/No Mercy/Battleground/Etc. (first of October)
Survivor Series (end of November or first of December)