I know less about Pokemons than you do about computers so I am incapable of making a comparison between raising the level cap between the two games. I mean, asking me to give you an answer about Pokemon is gonna give you the same amount of information that I can give you about quantum physics.
But let me give you some simple examples: The current exponential system of levels has many other properties. For one, the DNA required per level goes up, not linear, but with an increasingly high amount.
From level 29 to 30 for a common it’s 75.000 DNA. From 39 to 40 this would be somewhere near 750.000 DNA, which is more than you can hold, or practically farm in a year. Plus the accumulation of everything before that. No one wants to do this. Which means that raising the level cap requires for DNA requirements per level to be revised completely and this makes the whole leveling system either too easy or too hard. The DNA per dart will only be 40, so only 33% more per session. Basically the max on a common goes from 360 to 480. Not really an increase that allows for a tenfold investment.
And not to mention the cost. Right now from 29 to 30 is 250.000 coins. That’s gonna be a total of over 10 million coins to get one dino from 30 to 40.
And this is only about leveling up. The battle damage stats are also all calculated and based on the maximum of 30, which makes for a really really complicated recalculation of everything in the game. All boss fights, all pvp stats and everything need to change completely, not leaving anything intact from what the game is now.
You are literally asking for a new game.
So unless Pokemon Go has the same exponential level up, darting, battling, DNA and other systems in place, you cannot compare the games.